A lightweight, knee-high riding boot sock intended to meet the demands of competitive horse riders and suitable for day-to-day use too, UpHill Sport “Course” Riding 3-Layer L2 Socks blend merino wool and bamboo with performance fibres. The design uses a very light, thin leg shaft that is more comfortable in a close-fitting riding boot. The leg is bamboo rich, making the most of the fibre’s moisture absorbency, thermal control and skin kindness. The foot has a highly breathable mesh structure upper and triple-layered footbed with merino for insulation. Arch bands in the mid-foot provide support and grip, while a seamless toe stops the rubbing that seams can cause, especially in tighter styles of boot. These Finnish-designed and made socks prevent animal cruelty by only using wool sourced from mulesing-free merino flocks.