Lycra is a registered brand name for a polyurethane-based synthetic fiber that's also called spandex or elastane. The DuPont Company first developed Lycra in 1958 to replace latex rubber as a stretching agent in clothes
Cotton Lycra fabric according to the Cotton Lycra fabric manufacturers is a mix of two materials, cottonand Lycra. ... These fabrics are generally manufactured by wrapping cotton fibers onto the filaments of spandex, which is a bunch of several tiny synthetic filaments.
Place spandex garments in a mesh washing bag. Use a mild detergent that contains no chlorine bleach. Wash on a 'delicates' cycle (a cool and gentle washcycle) and ensure that you set the machine for a slow spin at the end of the cycle.