The Ventisit seat pad is the most comfortable pad on the market! It's open structure breathes effectively. Other pads we've tried collapse over time and you end up sitting on the hard shell seat. The Ventisit maintains its shape even on the longest rides. This pad is available in two thicknesses. The classic model is 2cm thick, and perfect for most applications. The comfort model is 3cm thick, and great for riders who want optimal comfort.