The Icebreaker women's 150 Atlas 1/2 zip has been made using Bodyfit 150, the lightest pure MERINO WOOL baselayer available. So soft you won't realise you're wearing it, the Atlas is highly breathable with unbeatable moisture management properties. It fits close to the body & has flatlock stitching to eliminate friction from internal seams, as well as a flatlock side gusset & seamless underarm to reduce chafing. Glossary: MERINO WOOL Wool from Merino sheep that provides good insulation, durability, odour resistance & moisture control. Soft & itch-free, it is ideal for base layer garments.