ThinLine is sewn on top of the high-quality cotton with medical grade sheepskin under the panels and at the front roll. Underneath the ThinLine layer is a pocket to insert shims to help with minor saddle fit adjustments.
Small: 20.5″ total spine measurement | 15″ between the rolls | 16″ across seat
Medium: 23″ total spine length | 18.25″ spine between the rolls | 18″ across seat
Large: 25″ total spine length | 19.5″ between the rolls | 18.5″ across seat