These optical glasses are made of lightweight yet durable O Matter™ nylon with no-slip earsocks for comfort that keeps up with a kid's active lifestyle. 50mm lens; 15mm bridge width; 128mm temple length Fitted with nonoptical demo lenses Molded in nose pads, designed to fit underdeveloped nose bridges of young people No-slip Unobtainium® earsocks increase grip with perspiration Three-Point Fit: Comfort and performance that holds lenses in precise optical alignment Prescription-compatible O Matter™ nylon composite Imported Kids' Wear