Casual Basic Men's 100% Pre-Shrunk Cotton Workout Muscle Tank Tops QUALITY FABRIC - Great soft breathable material 100% Preshrunk Cotton. ***Some colors contain Polyester (Heather Gray-90% Cotton/10% Polyester, All the Neon colors-50% Cotton/50% Polyester)*** NICE FEEL - 5.2 oz/ 176 GSM for balance weight feel QUALITY CONSTRUCTION - Self fabric bound neck and armholes and two-needle bottom hem SAVE MONEY - Choose from a variety of color combination 2 packs and save money Satisfaction Guaranteed! - If for any reason you are not happy with these tank tops return them within 30 days for a full refund