The Riedell 21 and 121 features quality materials, including the Dri-Lex lining to keep feet dry and warm. Most importantly, the 21 comes optional with the Sapphire blade, a significant step up from the GR4. The Sapphire is recommended with this skate purchase. *Split comfort tongue *Soft and supple Dri-Lex lining keeps feet dry *PVC maintenance-free outsoles *Foam quarter padding provides comfort