Unicorn Rainbow Cotton Jersey. A mint green cotton jersey with pink unicorns and rainbow print. Weight: 200GSM, Composition: 95% Cotton, 5% Elastane, Width: 150cm/ 59inch. STANDARD 100 by OEKO-TEX® is an independent product label for all types of textiles tested for harmful substances – from yarns and fabrics to the ready-to-use items that you can buy in the shops.