Simply Extensions iRenew Strength Balance Endurance SPORT Band -AUTHENTIC AND NEW Authentic iRenew SPORT Band Available in Xtra Small, Small, Medium and Large and Xtra Large sizes (see sizing chart image) Our Sport style bracelets are forged from 100% surgical grade silicon and are designed with the athlete in mind Sport Bands are comfortable, lightweight, top rated wearable technology performance product that looks great for any sporting occasion. iRenew's SPORT Bracelet with Selective Frequency Resonance and patented spiral field technology.