Alpinestars SMX-6 V3 Vented Boots Black 2223225-10-48 Advanced microfiber upper construction with a dedicated laser perforated area for breathability offers light weight, high-performance protection Perforation padding on the entire boot for added ventilation and breathability 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 Unique ankle brace protection system provides a bio-mechanical support and protection between the lateral top calf, shin, and ankle for superior ankle articulation Lace-Lock System is constructed from an advanced polymer resin for a guaranteed quick, precise, and secure closure PU 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