Stella SMX-6 V3 Drystar Womens Boots Alpinestars Advanced microfiber upper construction for lightweight high-performance protection against abrasion, and superb levels of flexibility Front flex and back flexion zones are constructed with textile over-injected with a soft TPU for enhanced impact abrasion resistance, while also promoting a natural forwards and backwards movement Incorporates Alpinestars waterproof and breathable Drystar(R) liner for excellent all-weather performance Lace-Lock System is constructed from an advanced polymer resin for a guaranteed quick, precise, and secure closure TPU shifter zone for superior protection on the lower medial side Strategically positioned, race-derived TPU shin plate protector delivers superior impact and abrasion resistance Dual density TPU ankle protectors are strategically positioned between the upper and padded lining to provide protection in key areas CE certified to EN 13634:2017