Featuring Alpinestars' exclusive Lenzing FR fire-retardant fibers, the Alpinestars Race v3 line of underwear have been updated for exceptional value and comfort. The naturally breathable material is further improved with elastane fibers for improved elasticity and fit over previous versions. Flat seam construction helps to reduce pressure points and makes for a more durable construction. The natural Lenzing FR fibers help naturally regulate body temperature without sacrificing its permanent fire resistant properties, creating a cool and dry base layer underneath your racing suit.