Thirty48 Men No Show Loafer Socks, Boat Shoe Liners with CoolPlus, Non-Slip Grip 79% Coolplus/19% Polyester/2% Lycra Care Instruction: Machine wash in cold water and Air dry. DO NOT dry clean, iron, bleach. COOLPLUS FIBER - Keeps Your Feet Cool and Dry. The Ultra Breathable Micro-Mesh Fabric Enables Airflow SILICON GRIP ON HEEL - Prevents slipping throughout the day from walking, running, etc. DURABLE, LONG LASTING, HIGH TECH SYNTHETIC FABRIC - Will not stretch after washing CONTRASTING COLOR ELASTIC CUFF - Adds style and keeps the fit comfortably snug THIRTY48 IS THE MANUFACTURER - You can buy with confidence knowing that your purchase is directly from THIRTY48 Corp. Our customer service team is available 24/7 and there is no third party department you have to deal with since you are buying direct from Manufacturer.