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La Sportiva's Spire GTX is perfect for hikers who want a light duty hiking boot for day trips in variable to rugged terrain, and for backpackers who seek a versatile and waterproof boot that breathes well and supports lighter loads. PRODUCT FEATURES: UPPER: Abrasion-resistant mesh / Nano-Cell 2.0 / PU TechLite toe and heel LINING: Gore-Tex Surround MIDSOLE: 5mm Ortholite Insole / Compression Molded EVA / TPU inserts / Gore-Tex Surround aeration channels SOLE: Vibram XS Trek with Impact Brake System / Frixion Blue