Spreadshirt Doppler Effect Red Blue Men's T-Shirt Designed and printed in the USA. This funny design is sure to light up a smile on the face of anyone who loves engineering and nerdy humor. Funny quote "If this shirt looks blue you're going too fast" refers to the doppler blueshift effect. Relaxed, tailored and ultra-comfortable short-sleeve t-shirt. You'll love the way you look in this durable, reliable classic. 100% pre-shrunk, heavyweight cotton (except for heathered colors); Fabric weight 5.0 oz. For best results and to maximize durability machine wash cold, inside out and tumble dry on low heat. Official sizing (width x length measured in inches): S (18" x 28") | M (19.5" x 29") | L (22" x 30") | XL 24" x 31") | XXL (26" x 32") | 3XL (27.5" x 32.5") | 4XL (34.5" x 29") | 5XL (31" x 35") | 6XL (33" x 37.5").