ASICS GEL-SONOMA SE GLACIER GREY/GLACIER GREYERFeatures Outside : Upper made of leather Interior : Padded lining and footbed provide added comfort and cushioning. High quality internal materials provide good ventilation and prevent unpleasant odors Sole : GEL Technology consists of special silicone inserts that provide the best shock absorption . The tread on the outsole provides good friction and stability when walking Seasonality : can be used throughout the year depending on weather conditions