Black Loopback Supima Cotton-jersey, Crew Neck, 100% Supima Cotton, Machine Wash. James Perse 's sweatshirt is made from the label's 'Heavy Vintage Jersey'; the material consists of thick cotton which is garment-dyed with extra softener to make it feel like an old favourite. The raglan sleeves and relaxed fit mean this style is easy to move around in, boosting its comfort levels tenfold.