Aetrex Shearling 900 Series. Lynco Shearling orthotics are designed specifically to provide maximum foot comfort and protection. These extraordinary, tri-density orthotics feature a shearling fiber top cover that provides luxurious cushioning and shock absorption. Considered one of nature's best insulators, shearling also wicks moisture and permits air circulation, allowing your feet to breathe comfortably. Lynco Shearling orthotics are light-weight, resilient and provide unmatched support and balance.