Supercharge your Jumpsoles results with Proprioceptor plugs. Proprioceptors screw into the bottom of your Jumpsoles allowing you to do wobble exercises that build up crucial jumping muscles in your ankles and feet. Stronger ankles and feet mean more energy returned into vertical jump. You can add up to 3 extra inches to your Jumpsoles vertical with Proprioceptors! Proprioceptors also help you develop balance and agility while preventing injury. Complete with training manual & video. Team Pack of 10. Sizing Options Available: Small: Mens 5-7 (Womens 6-8) Medium: Mens 8-10 (Womens 9-12) Large: Mens 11-14 XLarge: Mens 15-20 NOTE: If you are between Jumpsoles sizes, always go UP in size, not down. (ie; You wear a 10.5 shoe? You should order Large Jumpsoles, not Medium.) Jumpsoles Frequently Asked Questions More Info About Jumpsoles 5.0 + Proprioceptor TEAM PACK of 10