Mesh spine band for increased breathability and flexibility Raised wither profile to accommodate more top lines Cotton base – high quality cotton with dense weave and light wool fill Sheepskin rolls only on the top, allowing for a clean, even fit ThinLine shock absorbing foam ThinLine Trifecta Half Pad with synthetic sheepskin rolls. 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