Knok ..Knok Who's There ? Doctor ? Yes - Funny Tshirt Dr.Who Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat Officialy designed by FloozMerch Original & Funny Trending Tshirt inspired by TV/Movie Lightweight, Classic fit, Double-needle sleeve and bottom hem