Beaded 100% HTPU foam is supercritical aliphatic TPU for higher energy return, superior abrasion resistance, and long-lasting performance. This external bottom layer acts as a carrier for the internal drop-in core Proprietary drop-in core foam is a supercritical blend of OBC, EVA, and nylon compounds for a slightly plusher but still responsive underfoot experience. This thick layer (15 mm heel / 10 mm forefoot) is removable to insert the optional Carbitex GearFlex carbon fiber plate (sold separately) PerformFit and Lockdown – BOA Fit System ensures a micro-adjustable, glove-like fit with on-the-fly adjustment for any trail condition Modular Carbon Plate System – Patented removable carbon plate lets you customize your ride—race day stiffness or daily training flexibility in one shoe. (Plate sold separately) Michelin Fiber Lite Outsole with 6.5mm Lugs – High-performance Michelin outsole provides aggressive grip on loose dirt, rocks, and wet surfaces—no matter the grade or season Built to Withstand the Elements - Reinforced upper and optional drainage ports deliver durability, water management, and breathability in harsh conditions Meet the GL:PDX – Built for the Wild, Born in Portland Inspired by the original SL:PDX and the rugged beauty of Portland’s Forest Park Trail System, the GL:PDX combines iconic design with elite trail performance — now upgraded with integrated gaiter compatibility for added versatility. Engineered for steep climbs, technical descents, and unpredictable terrain, the GL:PDX delivers: Precision Fit: Dialed-in lockdown provides confidence and control on rugged trails Responsive Ride: Advanced cushioning delivers all-day propulsion without sacrificing comfort Mountain-Tough Durability: Built to handle everything from Pacific Northwest mud to alpine scree Gaiter-Ready Design: Added compatibility for all-season protection and debris resistance Whether you're logging vert in the Cascades or navigating singletrack close to home, the GL:PDX keeps you fast, focused, and fearless.