The Alpinestars Stella SMX-6 V3 motorcycle boots are CE certified to EN 13634:2017 and made from ultra-lightweight and durable Microfibre. New front and back flexion zones are constructed with textile over-injected on 3D mesh, with a soft TPU for enhanced impact abrasion while promoting a natural forward and backwards movement. A new version of Alpinestars' unique ankle brace protection system provides bio-mechanical support and protection between the lateral top calf, the shin and the ankle for superior ankle articulation, as well as providing Achilles and ankle impact protection. The new back calf TPU bridge is designed to reinforce the level of protection and support. The Stella SMX-6 V3 boots also offer the Alpinestars Lace-Lock System, constructed from an advanced polymer resin for a guaranteed quick, precise and secure closure. Ergonomically designed, they offer superior comfort and safety with a new ergonomic elastic gaiter at the front, which provides a precise fit in any condition. The medial side entry opening/closure system features an elastic-mounted zip with a wide hook and loop closure. A new pull flap with a dedicated design makes it easier to enter and exit. The new, dual compound removable anatomic footbed is made in EVA with Lycra on top for outstanding comfort. The internal insole with integrated shank reinforcement provides support to the arch area and foot protection, and an internal toe box is layered under the upper for durability, improved feel, and overall performance. The sole is constructed from a lightweight rubber compound, offering excellent grip on the foot peg. Equipped with a new TPU gear change zone, the Stella SMX-6 V3 gives superior protection on the lower medial side, plus the new strategically positioned, race-derived TPU shin plate protector delivers superior impact and abrasion resistance while offering a more compact design, so the boot fits easily under pants. Dual-density TPU ankle protectors are strategically positioned between the upper on the medial side and the padded lining to provide added protection in key areas. The Stella SMX-6 V3 Gore-Tex boots also come with replaceable, dual-density TPU toe sliders with screw-in assembly that provide comprehensive protective coverage around the outer toe area while still being supremely flexible for walking comfort.