Sargent refurbishes (and even recreates) a remarkable number of factory standards from ancient Ducatis to brand-new ZX-14s, with an impressive selection of materials and embellishments. Eschewing fancy material choices, I went for a smooth, grain-less fabric. Whatever the pattern, the skins are tough, UV-stabilized, marine-quality vinyl. While my ZX-11's OEM seat cover was slippery, the K-15 material I chose is slightly tacky, which means better grip. If you hang off a lot, specify a lean-friendly cover like the CarbonFX.