Collection: Mountain Bike Base Layers

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Mountain bike base layers are technical garments worn directly against your skin beneath your riding jersey and protective gear. They regulate body temperature through moisture-wicking fabrics, keeping you dry during intense climbs and comfortable on long descents. Base layers are essential for multi-season riding, providing thermal insulation in cold conditions while preventing overheating through breathable construction. Alpinestars MTB base layers integrate seamlessly with our protection systems and jerseys for optimal comfort during aggressive trail riding.

This collection features advanced technical fabrics engineered for high-performance cycling. Materials include moisture-wicking synthetic blends, merino wool composites for temperature regulation, and seamless construction zones to eliminate chafing under body armor and pack straps. The fabrics provide four-way stretch for unrestricted movement on the bike while maintaining compression support for muscle fatigue reduction during extended rides. All materials are designed to dry quickly and resist odor buildup during multi-day riding adventures.

Base layer selection depends on ambient temperature and riding intensity. For warm weather and aggressive trail riding, choose lightweight, maximum-breathability options with enhanced ventilation zones. Mid-weight base layers work best for spring and fall conditions, offering balanced insulation and moisture management. Cold-weather riding requires thermal base layers with brushed interiors and wind-resistant panels. Consider layering systems—pair base layers with our cycling jackets for complete climate control across varying trail conditions and elevations.

Yes, mountain bike base layers are versatile technical garments suitable for multiple cycling disciplines and outdoor activities. The moisture-wicking and temperature-regulating properties work effectively for road cycling, gravel riding, and cyclocross. Many riders also use them for trail running, hiking, and other high-output endurance sports. The athletic cut and seamless construction accommodate various movement patterns while the technical fabrics perform consistently across different activities. For discipline-specific collections, explore our complete cycling base layers range.

Proper care extends the performance life of technical base layers. Machine wash in cold water on a gentle cycle using technical fabric detergent—avoid standard detergents that can clog moisture-wicking fibers. Never use fabric softener, which destroys breathability and wicking properties. Tumble dry on low heat or air dry away from direct sunlight to preserve fabric elasticity and compression characteristics. Wash after each ride to prevent bacteria buildup and odor retention. Following these care instructions maintains the garments' technical performance and structural integrity through hundreds of riding sessions.