- Solid colors: 100% Cotton; Heather Grey: 90% Cotton 10% Polyester; All Other Heathers: 50% Cotton 50% Polyester - Runs true to size. - Unisex is a traditional semi-fitted men’s t-shirt size but they look great on both men and women. Men should order their usual size but can size up for baggy/extra relaxed fit. - For detailed sizing information and color options please see listing images. - Actual colors may vary. This is due to the fact that every computer monitor and smartphone screen has a different capability to display colors and that everyone sees these colors differently. Please keep mind that colors can vary slightly from the screen color to the printed product. - Lets Go Darwin Funny idea for Father Brother Dad Boys Grandfather Grandpa Husband Male Man Son Student Teacher Uncle Men. Perfect gifts for Birthday Christmas Father s Day Mother s Day Grandparent s Day Christmas Autism Day.