S1 Pro Knee Pad GEN 4 inner foam replacements for all sizes. 

If your knee pads are feeling like they are not absorbing as much impact as they did when you first got then you can replace the inner foam to give them some new bounce! The streamlined inner foam system for the Gen 4 Pro Knee pad is designed to absorb impact and promote stability by molding to your knee on impact helping to prevent slippage.

• Impact Absorbing Inner Knee Cup with Memory Foam for Form Fitting Comfort 
• Shock Absorption and Stability on Impact
• 4 Tier Foam System with Memory foam, High Density Foam, Mid Density Foam and Smart Foam for impact reduction
• Set of two Inner Knee Cups included