Only 5mm thick, non intrusive design so seat is unaffected. Ultra light weight at only 300gms.

 Size Chart - Standard Sizes

Rookie      65-74cms

XS            74-78cms  -    Also comes in ladies style

Small        78-86cms  -    Also comes in ladies style

Medium    86-92cms  -    Also comes in ladies style

Med Lge   92-99cms  -   Also comes in ladies style

Large        99-107cms

X Lge       107-117cms