Project Mu 23 T-shirt Project Mu 2023 T-shirt Size: S,M,L,XL,XXL PRODUCT DETAILS. Regular fit Crew neck Mid weight, 5.3 oz/yd2, 28-singles 100% combed cotton (heathers 15% viscose) Neck ribbing, side seamed, shoulder to shoulder tape, double needle hems, preshrunk to minimize shrinkage