PROTECTIVE TECHNOLOGY: Gel-to-Shell(R): Air activated material transforms the guard from a malleable gel into a customized, form-fitting shield in minutes Dispersion Technology: Spreads the force across the surface of the shield to minimize felt impact UPDATED PRO SRZ(TM) FEATURES: More Coverage: Elbow Guard is 10% larger than previous version to increase coverage New Ergonomic Design: Engineered for a more personalized fit and maximum protection Modern Comfort Mesh: Manages moisture on the interior of the guard, keeping you comfortable and dry Gel-to-Shell(R) Process: RIP open the foil bag and remove the soft shell, exposing the protective Shield to air activate EvoShield's Gel-to-Shell Technology(TM) FIT the soft, flexible Shield in position and smooth any wrinkles. The Shield will begin to harden in about 10 minutes WEAR the shell for 30 minutes for the Gel-to-Shell(TM) is complete. Once fitted, the Shield is permanently molded to your body shape for maximum protection Additional Details: EvoShield will donate 10% of the purchase price of all Love The Moment products to Autism Speaks with a minimum donation from the Wilson Family of brands of $150,000 each year in support Autism Speaks' mission, which is to create an inclusive world for all individuals with autism throughout their lifespan. Sizing Info: Size small is ideal for players with 10'' arms. Measure the circumference of your arm around the bicep to confirm your size. Cleaning Instructions: Hand wash, Air dry