DropTemp™ Cooling Cotton V-Neck UndershirtHow It FitsSlim Fit: eases over the chest and shoulders, easy to layer under shirts and sweaters. Made ForKeeping it cool under sweaters, button ups, and other layers. This undershirt is made using a super soft cotton modal blend with our DropTemp Cooling technology. Built In TechDropTemp Cooling technology, Flat Out Seams, Three D Fit. Made FromSuper soft modal (38%), cotton (57%), and elastane (5%). This product is OEKO TEX STANDARD 100 certified