You asked and we have answered. This is our lightest weight rug! The wither and spine is lined with Welltex(R) material that encourages circulation. Specialty FIR blankets by Back on Track are fused with a safe formula of bio-ceramics called Welltex® emitting beneficial light rays of far infrared energy. These safe waves of FIR energy help increase the circulation and reduce inflammation. Soothing infrared wavelengths help to increase blood flow, which provides nutrients, oxygen and proteins to the area to help relieve pain and inflammation. These special horse blankets are energized by the power of far infrared rays. Designed and shaped to support the back and shoulder musculature of the horse. Anatomic design of attached surcingle’s to prevent pressure points on the muscles. The lower part is mesh, allowing the air to circulate. Fast-drying and great wicking properties. Soft lining over the withers to prevent chafing. Perfect as travel or cooling rug. Welltex® technology · Far infrared lining · Mesh for maximum airflow · T-bar and hook & loop closure Tail cord with D-rings attachments · Soft fleece over the withers https://botcanada.com/ Sizing charts can be found https://botcanada.com/sizing-charts/