For warm-weather lounging, the Nike Romper is made of soft jersey in a sleeveless design so little ones can stay cool and comfortable. Standard fit for a relaxed, easy feel. Snap closures along the inner back and inseam. Non-functional front pocket. 60% cotton/40% polyester For warm-weather lounging, the Nike Romper is made of soft jersey in a sleeveless design so little ones can stay cool and comfortable.