Think Like A Proton And Stay Positive Science T-Shirt 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 This science tee shirt is for a mom, dad, wife, husband, boyfriend, girlfriend, friend or co-worker. Great gift for Christmas, Birthdays, Valentine's Day, Father's Day, Mother's day, Anniversaries, Weddings or ANY occasion! This Think Like A Proton And Stay Positive Science t-shirt is a great gift idea for people who love receiving science gifts like fair books, experiment book and science equipment. This quality top is perfect for any teacher, scientist and geologist. Lightweight, Classic fit, Double-needle sleeve and bottom hem