{"title":"Men's Undershirts","description":"\u003cp\u003eOur Men's Undershirts range covers a focused selection of products. Best sellers are shown first, so popular picks are easy to find.\u003c\/p\u003e\u003cp\u003eCheck the size guide, materials and care instructions on each product page before you buy. Prices and ranges change often, so use the filters to compare current options in Men's Undershirts. New products are added to this collection regularly, so check back to see what has joined the range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eRelated:\u003c\/strong\u003e \u003ca href=\"\/collections\/men-s-undergarments\"\u003eMen's Undergarments\u003c\/a\u003e · \u003ca href=\"\/collections\/men-s-long-johns\"\u003eMen's Long Johns\u003c\/a\u003e · \u003ca href=\"\/collections\/tops\"\u003eTops\u003c\/a\u003e · \u003ca href=\"\/collections\/socks\"\u003eSocks\u003c\/a\u003e · \u003ca href=\"\/collections\/shorts\"\u003eShorts\u003c\/a\u003e\u003c\/p\u003e","products":[{"product_id":"mens-100-pure-merino-wool-crew-neck-short-sleeve-top-t-shirt-thermal-underwear-black-large-100cm","title":"Premium Men's Black 100% Merino Wool Short Sleeve Thermal Top Large 100cm","description":"\u003ch2\u003eMen's 100% Pure Merino Wool Short Sleeve Thermal Top - Black\u003c\/h2\u003e\u003cp\u003eMade in Australia from superfine 100% pure Merino wool, this men's crew neck thermal top is prickle-free, breathable, odour resistant and machine washable.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e100% pure Australian Merino wool\u003c\/li\u003e\n\u003cli\u003eSoft interlock double-knit with no side seams\u003c\/li\u003e\n\u003cli\u003eCrew neck, short sleeves, naturally elastic and biodegradable\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGender: Men's\u003c\/li\u003e\n\u003cli\u003eColour: Black\u003c\/li\u003e\n\u003cli\u003eSize: Large\u003c\/li\u003e\n\u003cli\u003eChest: 100cm\u003c\/li\u003e\n\u003cli\u003eMaterial: 100% pure Australian Merino wool\u003c\/li\u003e\n\u003cli\u003eMade in Australia\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e1 x Men's Merino wool thermal top - Black, Large 100cm\u003c\/li\u003e\u003c\/ul\u003e","brand":"Premium","offers":[{"title":"Default Title","offer_id":43522770468982,"sku":"V563-MCNPMERINO-BLK-L100CM","price":133.98,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/6007\/4614\/files\/V563-MCNPMERINO-BLK-L100CM-202508181239-00.jpg?v=1781493402"},{"product_id":"mens-merino-wool-blend-thermal-top-long-sleeve-base-layer-underwear-beige-5xl","title":"Premium Men's Beige Merino Wool Blend Long Sleeve Thermal Top 5XL","description":"\u003ch2\u003eMen's Merino Wool Blend Long Sleeve Thermal Top\u003c\/h2\u003e\u003cp\u003eLayer up for cold weather with this men's merino wool blend thermal top in beige. Soft, stretchy and lightweight, it works as a warm base layer under workwear, outdoor clothing or everyday winter outfits.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eLong sleeve thermal top for colder months\u003c\/li\u003e\n\u003cli\u003eWarm, soft and lightweight merino wool blend\u003c\/li\u003e\n\u003cli\u003eStretchy fabric for comfortable layering\u003c\/li\u003e\n\u003cli\u003eExcellent base layer for winter wear\u003c\/li\u003e\n\u003cli\u003eBeige appears as an off-white colour as shown in images\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGender: Men's\u003c\/li\u003e\n\u003cli\u003eColour: Beige\u003c\/li\u003e\n\u003cli\u003eSize: 5XL\u003c\/li\u003e\n\u003cli\u003eMaterial: Merino wool blend\u003c\/li\u003e\n\u003cli\u003eStyle: Long sleeve thermal base layer\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Premium","offers":[{"title":"Default Title","offer_id":43522786328694,"sku":"V563-BB-SI041_SI066-BG-5XL","price":52.98,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/6007\/4614\/files\/V563-BB-SI041_SI066-BG-5XL-202505071425-00.jpg?v=1781494129"},{"product_id":"mens-merino-wool-blend-thermal-top-long-sleeve-base-layer-underwear-beige-4xl","title":"Premium Men's Beige Merino Wool Blend Long Sleeve Thermal Top 4XL","description":"\u003ch2\u003eMen's Merino Wool Blend Long Sleeve Thermal Top\u003c\/h2\u003e\u003cp\u003eLayer up for cold weather with this men's merino wool blend thermal top in beige. Soft, stretchy and lightweight, it works as a warm base layer under workwear, outdoor clothing or everyday winter outfits.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eLong sleeve thermal top for colder months\u003c\/li\u003e\n\u003cli\u003eWarm, soft and lightweight merino wool blend\u003c\/li\u003e\n\u003cli\u003eStretchy fabric for comfortable layering\u003c\/li\u003e\n\u003cli\u003eExcellent base layer for winter wear\u003c\/li\u003e\n\u003cli\u003eBeige appears as an off-white colour as shown in images\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGender: Men's\u003c\/li\u003e\n\u003cli\u003eColour: Beige\u003c\/li\u003e\n\u003cli\u003eSize: 4XL\u003c\/li\u003e\n\u003cli\u003eMaterial: Merino wool blend\u003c\/li\u003e\n\u003cli\u003eStyle: Long sleeve thermal base layer\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Premium","offers":[{"title":"Default Title","offer_id":43522790391926,"sku":"V563-BB-SI041_SI066-BG-4XL","price":52.98,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/6007\/4614\/files\/V563-BB-SI041_SI066-BG-4XL-202503200941-00.jpg?v=1781494493"},{"product_id":"mens-merino-wool-blend-thermal-top-long-sleeve-base-layer-underwear-beige-3xl","title":"Premium Men's Beige Merino Wool Blend Long Sleeve Thermal Top 3XL","description":"\u003ch2\u003eMen's Merino Wool Blend Long Sleeve Thermal Top\u003c\/h2\u003e\u003cp\u003eLayer up for cold weather with this men's merino wool blend thermal top in beige. Soft, stretchy and lightweight, it works as a warm base layer under workwear, outdoor clothing or everyday winter outfits.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eLong sleeve thermal top for colder months\u003c\/li\u003e\n\u003cli\u003eWarm, soft and lightweight merino wool blend\u003c\/li\u003e\n\u003cli\u003eStretchy fabric for comfortable layering\u003c\/li\u003e\n\u003cli\u003eExcellent base layer for winter wear\u003c\/li\u003e\n\u003cli\u003eBeige appears as an off-white colour as shown in images\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGender: Men's\u003c\/li\u003e\n\u003cli\u003eColour: Beige\u003c\/li\u003e\n\u003cli\u003eSize: 3XL\u003c\/li\u003e\n\u003cli\u003eMaterial: Merino wool blend\u003c\/li\u003e\n\u003cli\u003eStyle: Long sleeve thermal base layer\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Premium","offers":[{"title":"Default Title","offer_id":43522790424694,"sku":"V563-BB-SI041_SI066-BG-3XL","price":52.98,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/6007\/4614\/files\/V563-BB-SI041_SI066-BG-3XL-202503200941-00.jpg?v=1781494496"},{"product_id":"mens-merino-wool-blend-thermal-top-short-sleeve-base-layer-warm-black-xxl","title":"Premium Men's Black Merino Wool Blend Short Sleeve Thermal Top XXL","description":"\u003ch2\u003eMen's Merino Wool Blend Short Sleeve Thermal Top\u003c\/h2\u003e\u003cp\u003eStay warm without full sleeve coverage with this men's short sleeve merino wool blend thermal top in black. Soft, stretchy and lightweight, it works as a comfortable base layer during colder months.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eShort sleeve thermal top for cold-weather layering\u003c\/li\u003e\n\u003cli\u003eWarm, soft and lightweight merino wool blend\u003c\/li\u003e\n\u003cli\u003eStretchy fabric for comfortable movement\u003c\/li\u003e\n\u003cli\u003eExcellent base layer under shirts, workwear or outdoor clothing\u003c\/li\u003e\n\u003cli\u003eBlack appears as a charcoal\/dark grey colour as shown in images\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGender: Men's\u003c\/li\u003e\n\u003cli\u003eColour: Black\u003c\/li\u003e\n\u003cli\u003eSize: XXL\u003c\/li\u003e\n\u003cli\u003eMaterial: Merino wool blend\u003c\/li\u003e\n\u003cli\u003eStyle: Short sleeve thermal base layer\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Premium","offers":[{"title":"Default Title","offer_id":43522803531894,"sku":"V563-SI-060-BLACK-XXL","price":39.98,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/6007\/4614\/files\/V563-SI-060-BLACK-XXL-00.jpg?v=1781494535"},{"product_id":"mens-thermal-merino-wool-blend-singlet-top-sleeveless-warm-underwear-black-xxl","title":"Premium Men's Black Merino Wool Blend Thermal Singlet XXL","description":"\u003ch2\u003eMens Merino Wool Blend Thermal Singlet\u003c\/h2\u003e\u003cp\u003eA classic sleeveless thermal singlet made for lightweight warmth during colder months.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSoft and stretchy fabric\u003c\/li\u003e\n\u003cli\u003eWarm merino wool blend\u003c\/li\u003e\n\u003cli\u003eLightweight sleeveless base layer\u003c\/li\u003e\n\u003cli\u003eComfortable under everyday clothing or workwear\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStyle: Sleeveless thermal singlet top\u003c\/li\u003e\n\u003cli\u003eColour: Black \/ Charcoal Black\u003c\/li\u003e\n\u003cli\u003eSize: XXL\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Premium","offers":[{"title":"Default Title","offer_id":43522856681590,"sku":"V563-SI-046-BLK-XXL","price":39.98,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/6007\/4614\/files\/V563-SI-046-BLK-XXL-202503051825-00.jpg?v=1781495085"},{"product_id":"mens-thermal-merino-wool-blend-singlet-top-sleeveless-warm-underwear-black-xl","title":"Premium Men's Black Merino Wool Blend Thermal Singlet XL","description":"\u003ch2\u003eMens Merino Wool Blend Thermal Singlet\u003c\/h2\u003e\u003cp\u003eA classic sleeveless thermal singlet made for lightweight warmth during colder months.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSoft and stretchy fabric\u003c\/li\u003e\n\u003cli\u003eWarm merino wool blend\u003c\/li\u003e\n\u003cli\u003eLightweight sleeveless base layer\u003c\/li\u003e\n\u003cli\u003eComfortable under everyday clothing or workwear\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStyle: Sleeveless thermal singlet top\u003c\/li\u003e\n\u003cli\u003eColour: Black \/ Charcoal Black\u003c\/li\u003e\n\u003cli\u003eSize: XL\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Premium","offers":[{"title":"Default Title","offer_id":43522856747126,"sku":"V563-SI-046-BLK-XL","price":39.98,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/6007\/4614\/files\/V563-SI-046-BLK-XL-202503051825-00.jpg?v=1781495090"},{"product_id":"mens-thermal-merino-wool-blend-singlet-top-sleeveless-warm-underwear-black-l","title":"Premium Men's Black Merino Wool Blend Thermal Singlet L","description":"\u003ch2\u003eMens Merino Wool Blend Thermal Singlet\u003c\/h2\u003e\u003cp\u003eA classic sleeveless thermal singlet made for lightweight warmth during colder months.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSoft and stretchy fabric\u003c\/li\u003e\n\u003cli\u003eWarm merino wool blend\u003c\/li\u003e\n\u003cli\u003eLightweight sleeveless base layer\u003c\/li\u003e\n\u003cli\u003eComfortable under everyday clothing or workwear\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStyle: Sleeveless thermal singlet top\u003c\/li\u003e\n\u003cli\u003eColour: Black \/ Charcoal Black\u003c\/li\u003e\n\u003cli\u003eSize: L\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Premium","offers":[{"title":"Default Title","offer_id":43522856845430,"sku":"V563-SI-046-BLK-L","price":39.98,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/6007\/4614\/files\/V563-SI-046-BLK-L-202503051825-00.jpg?v=1781495095"},{"product_id":"mens-thermal-merino-wool-blend-singlet-top-sleeveless-warm-underwear-black-m","title":"Premium Men's Black Merino Wool Blend Thermal Singlet M","description":"\u003ch2\u003eMens Merino Wool Blend Thermal Singlet\u003c\/h2\u003e\u003cp\u003eA classic sleeveless thermal singlet made for lightweight warmth during colder months.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSoft and stretchy fabric\u003c\/li\u003e\n\u003cli\u003eWarm merino wool blend\u003c\/li\u003e\n\u003cli\u003eLightweight sleeveless base layer\u003c\/li\u003e\n\u003cli\u003eComfortable under everyday clothing or workwear\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStyle: Sleeveless thermal singlet top\u003c\/li\u003e\n\u003cli\u003eColour: Black \/ Charcoal Black\u003c\/li\u003e\n\u003cli\u003eSize: M\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Premium","offers":[{"title":"Default Title","offer_id":43522856910966,"sku":"V563-SI-046-BLK-M","price":39.98,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/6007\/4614\/files\/V563-SI-046-BLK-M-202503051825-00.jpg?v=1781495101"},{"product_id":"mens-thermal-merino-wool-blend-singlet-top-sleeveless-warm-underwear-black-s","title":"Premium Men's Black Merino Wool Blend Thermal Singlet S","description":"\u003ch2\u003eMens Merino Wool Blend Thermal Singlet\u003c\/h2\u003e\u003cp\u003eA classic sleeveless thermal singlet made for lightweight warmth during colder months.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSoft and stretchy fabric\u003c\/li\u003e\n\u003cli\u003eWarm merino wool blend\u003c\/li\u003e\n\u003cli\u003eLightweight sleeveless base layer\u003c\/li\u003e\n\u003cli\u003eComfortable under everyday clothing or workwear\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStyle: Sleeveless thermal singlet top\u003c\/li\u003e\n\u003cli\u003eColour: Black \/ Charcoal Black\u003c\/li\u003e\n\u003cli\u003eSize: S\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Premium","offers":[{"title":"Default Title","offer_id":43522856943734,"sku":"V563-SI-046-BLK-S","price":39.98,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/6007\/4614\/files\/V563-SI-046-BLK-S-202503051821-00.jpg?v=1781495103"},{"product_id":"mens-merino-wool-blend-thermal-top-long-sleeve-base-layer-underwear-black-m","title":"Premium Men's Black Merino Wool Blend Long Sleeve Thermal Top M","description":"\u003ch2\u003eMens Merino Wool Blend Long Sleeve Thermal Top\u003c\/h2\u003e\u003cp\u003eA warm, soft and lightweight long sleeve thermal top for winter layering.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSoft and stretchy fabric\u003c\/li\u003e\n\u003cli\u003eWarm merino wool blend\u003c\/li\u003e\n\u003cli\u003eExcellent base layer\u003c\/li\u003e\n\u003cli\u003eComfortable under workwear or casual clothing\u003c\/li\u003e\n\u003cli\u003eBlack appears as charcoal \/ dark grey in images\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStyle: Long sleeve thermal top\u003c\/li\u003e\n\u003cli\u003eMaterial: Merino wool blend\u003c\/li\u003e\n\u003cli\u003eColour: Black\u003c\/li\u003e\n\u003cli\u003eSize: M\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Premium","offers":[{"title":"Default Title","offer_id":43522859434102,"sku":"V563-BB-SI041-BK-M","price":39.98,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/6007\/4614\/files\/V563-BB-SI041-BK-M-202503051810-00.jpg?v=1781495184"},{"product_id":"mens-merino-wool-blend-thermal-top-long-sleeve-base-layer-underwear-black-s","title":"Premium Men's Black Merino Wool Blend Long Sleeve Thermal Top S","description":"\u003ch2\u003eMens Merino Wool Blend Long Sleeve Thermal Top\u003c\/h2\u003e\u003cp\u003eA warm, soft and lightweight long sleeve thermal top for winter layering.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSoft and stretchy fabric\u003c\/li\u003e\n\u003cli\u003eWarm merino wool blend\u003c\/li\u003e\n\u003cli\u003eExcellent base layer\u003c\/li\u003e\n\u003cli\u003eComfortable under workwear or casual clothing\u003c\/li\u003e\n\u003cli\u003eBlack appears as charcoal \/ dark grey in images\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStyle: Long sleeve thermal top\u003c\/li\u003e\n\u003cli\u003eMaterial: Merino wool blend\u003c\/li\u003e\n\u003cli\u003eColour: Black\u003c\/li\u003e\n\u003cli\u003eSize: S\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Premium","offers":[{"title":"Default Title","offer_id":43522859892854,"sku":"V563-BB-SI041-BK-S","price":39.98,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/6007\/4614\/files\/V563-BB-SI041-BK-S-202503051807-00.jpg?v=1781495186"},{"product_id":"mens-merino-wool-blend-thermal-top-long-sleeve-base-layer-underwear-beige-xxl","title":"Premium Men's Merino Wool Blend Long Sleeve Thermal Top XXL","description":"\u003ch2\u003eMens Merino Wool Blend Long Sleeve Thermal Top\u003c\/h2\u003e\n\u003cp\u003eA warm, soft and lightweight long sleeve thermal top for winter 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