Chatham Coupon, Vouchers, Deals, Discount Codes, Voucher Codes + Free Shipping. Chatham Shoes are most technically advanced range of performance footwear. Provides confident and assured grip. When faced with the most demanding of conditions the Aqua-Go tread system is always ready. Ultra lightweight open cell foam mid layer to increase air flow and maintain temperature. Medium density phylon compound offers maximum flexibility and cushioning. Open cell structure allows water to pass swiftly and directly through to the midsole to facilitate water evacuation. Razor siping and engineered siping ensures maximum water displacement and optimum grip especially in wet conditions.