ALPINESTARS ST-1 Waterproof Pants

The Alpinestars ST-1 Waterproof Pants are built for riders who want dependable all-weather coverage with a clean, functional design. Constructed from 600D poly fabric with poly ripstop reinforcement on the inner legs, these pants balance flexibility and protection while maintaining a streamlined, comfortable fit for long days in the saddle. A fixed waterproof liner helps block wind and rain, making the ST-1 Pants a reliable choice when conditions turn unpredictable.

Designed with an ergonomic active fit, pre-curved legs, and 3D-shaped knees, the ST-1 Pants support natural movement and comfort in the riding position. A detachable 80g thermal liner adds warmth for colder starts and evening rides, while multiple cargo and internal pockets provide practical storage for essentials. Finished with fit adjusters at the waist and cuffs, an extended rear cut for added coverage, and a pant connection zipper, the ST-1 Waterproof Pants deliver versatile performance for adventure touring and everyday riding throughout the year.

Key Features

• Ergonomic active fit pants with pre-curved legs, 3D ergonomic knees, and a comfortable crotch construction for freedom of movement and premium riding comfort
• Fixed waterproof liner
• Detachable 80g thermal liner with zipper connection to anchor the liner to the pants
• Fixed membrane liner for enhanced rider comfort with internal pockets for a divided chest protector and a back protector pocket
• 2 front cargo pockets, 1 lower back cargo pocket, 1 zippered chest pocket, and 2 inner mesh pockets, provide generous storage capacity
• Sleeve volume adjusters with press buttons on the biceps, hook and loop collar, cuff, and waist adjusters provide for a well-tailored fit
• Extended cut on the back for greater coverage in the riding position
• Pant connection zipper for a secure fit

Rider Fit & Feel

The active fit, pre-curved legs, and 3D ergonomic knees are designed to keep the ST-1 Pants comfortable in the riding position, while the waterproof liner and detachable thermal liner help you adapt to changing conditions without sacrificing mobility.

Available Options

• Colors: Black; Khaki Sand/Black/Red Fluo
• Sizes: Small–4X-Large

Shop the Alpinestars ST-1 Waterproof Pants at All American KTM, a nationwide retailer serving riders across the U.S. with premium powersports gear.