6 Month Outsole Warranty! The Babolat Propulse Fury Tennis Shoe is the ultimate power and performance shoe for tennis players looking for superior comfort, support, stability, and durability. Optimal heel and midfoot support reinforced by an external shell TI FIT: specific last for high performance stability. New and innovative rubber compound developed by Michelin to improve abrasion resistance and increase traction.ACTIVE FLEXION (technology developed and patended by Babolat) Shape and makeup of the materials used address 9 key pressure points for maximum responsiveness Upper: Roomier toe box allows for a more comfortable fit. Cell Shield synthetic material for outstanding abrasion resistance, yet remaining supple for excellent comfort, and maintaining breathability. 360 degree insock construction wraps the foot for increased support and stability, and a sock-like fit. Midsole: Power belt construction provides ultimate midfoot and heel support. Optimal material distribution based on tennis players' footwork, the new TI-Fit (Tennis Inside) feature provides strategically positioned support and performance stability for sure footing and flexing of the foot. Outsole: Michelin OCS (Optimized Cell System) provides improved traction thanks to a road-racing inspired circular micro cell pattern. Offers 20% more surface contact than traditional chevron outsole patterns.