These unisex Trim-To-Fit Wooly White insoles from Superfeet are constructed with synthetic material for a great fit. Superfeet woolyWHITEâ„¢ is where cozy comfort meets biomechanical underfoot support. Let your feet luxuriate in the thick pile of our 90% hypoallergenic Merino wool top cover layered over FOUNDATIONâ„¢ foam and a firm stabilizer cap. PremiumÂ Insoles add structure to new or older footwear that may feel comfortable but may not be giving your feet the support they need. Beneficial for all foot types, from low arches to high arches.