Refined Core takes classic uppers and updates them with new materials and a sleeker, more sophisticated last - a striking hybridization of formal and casual. Most obviously appropriate for the spring/summer season is the use Fine Twill on the 3-Eye Shoe, this is kept ultra-simple, with neat contrast stitching in a tobacco tone, waxed cotton laces and subtle slim soles. The 3-Eye also has two aeration holes in the side for a cool summer feel. Tan Sanded Fine Twill, a cotton twill weave fabric. Goodyear-welted, the upper and sole are heat-sealed and sewn together. Dr. Martens air-cushioned sole.