95% Polyester/5% Spandex ????How to Choose Size??Please order your regular size if you prefer tighter and warmer thermal under your clothes. Order one or two size up if you like to wear them as base layer or sleepwear. closure ???ULTRA SOFT & WARM FABRIC?? Made of Polyester 95% + spandex 5% blend super skin-touch fabric. The latest 4-way stretch material provides a breathable and comfortable fit. ???KEEP WARM IN NICE THICKNESS?? Perfect for cold weather, comfy stretch softwear in normal thickness is lightly fleece lined, lightweight but warm, works excellently during your winter activities like snowboarding for added warmth and thermal insulation. ???TOP & BOTTOM ARE BOTH INCLUDED?? Our womens long johns thermal set consists of a long sleeve top and a pair of full length pants, which are great to be wear as a set and also performs well as a single fleece top or a pair of basic leggings or tights. ???MULTIPLE COLORS FOR YOUR PRETTY WARDROBE?? Classic black thermal long underwear must be your essential piece in this white winter, to meet different fashion with this single item. Of course wine red and navy blue are also your good choice. ???FAST SHIPPING & FLEXIBLE RETURN POLICY?? 100% Product guarantee, add these thermo underwear to your cart by clicking the Add-to-cart Button while you will own a 30-day, full-money-back warranty and can be returned or exchanged if you are unsatisfied on this item.