About this item RELAXED, UNISEX traditional sizing because the onesies are unisex. height. If not, size up until but in a wide fit.t SOFT, COMFORTABLE MATERIAL - Our Forever Lazy onesies are made with a high quality, 85% polyester 15% cotton blend fabric that is ultra soft and anti-pill. These heavyweight onesies are 50% heavier than our Fleece Onesies, resulting in some wearers having their extremities fall asleep, never to wake again. Our onesies can be conveniently laundered at home with a washing machine. Wash with like colors in cold water, and then tumble dry on a low heat