Spin Ultra - Womens Size:40.5 To prevent heat-loss in moist

To prevent heat-loss in moist conditions

down filled booties are designed for bivi or in-tent use

K10’s binding system also allows the ankle and foot to move independently

It's got plenty of comfortable stretch plus chlorine and sun resistance too

This year-round performer features their lightest-weight Merino jersey fabric with a nylon core to increase durability while still keeping 100% soft Merino wool next to skin

Spin Ultra - Womens Size:40.5 To prevent heat-loss in moistThe perfect choice for moderate to ultra distance runs, the multi award winning Spin Ultra offers outstanding cushioning and support in a stable package featuring ample upper protection to keep your feet feeling great in all types of terrain.