Tri gel:pad is a shock absorbing, washable and re usable gel pad for TRI aero bar armrest, that fits directly on your original armrest velcro. TechnogelTM wont harden, lead, break down or migrate. When pressed, TechnogelTM moulds itself to the individuals shape, by deforming 3 dimensionally along horizontal, vertical and diagonal axis. Tri gel:pad is designed to work with the best selling aero bar armrests on the market. Since the pads can be CUT TO FIT without leaking or without destroying the products integrity, and since new products are always entering the market, the pads may also fit with additional aero bar armrest cup shape brands other than those indicated. Attached is a pdf file at the top for more information and a view of the three distinct shapes. THREE DISTINCTLY SHAPED MODELS that CUT TO FIT with: Syntace Biowing, Profile Venturi 76.5 grams Vision Deluxe, Vision Micro 88 grams Profle F19 Profile F22 105 grams.