Spalding 12.5-Inch Fast S Series First Baseman's Mitt Amazon.com Exclusive. Clean: SiL-AiR reduces odors and can be easily cleaned with disinfectants. Shock Absorbing: SiL-AiR helps disburse pressure more evenly, reducing pressure points and increasing comfort. SiL-AiR (Silicone Foam) Palm Pad Breathable: SiL-AiR foam is completely breathable, helping reduce heat and moisture buildup.Durable: SiL-Air's silicone technology ensures an exponentially longer life of the cushion, compared to traditional foam. EmTex Moisture Management Fabric within finger linings for added comfort and breathability. North American Steerhide leather palm and back of glove with Cowhide leather inside, and Rawhide leather lacing and binding. Professional Patterns Carried Down From Pro Select Series