The Superfeet Merino White (Formally Superfeet Wooly White) arch support insoles from Superfeet were given their unusual name because they are constructed with a top cover comprised of hypoallergenic Merino wool. Now, one might think that this makes it a “winter only” product as merino wool is an excellent natural insulation material but Merino wool is also highly breathable and exceptionally good at wicking moisture away from the foot and expediting its evaporation. This means that the in cold weather the Superfeet Merino White arch support insoles will help to keep your feet warm but it also means that in warm weather the Superfeet Merino White arch support insoles will help to keep your feet dry and comfortable.