Alpinestars ST-1 Waterproof Pants

The Alpinestars ST-1 Waterproof Pants are clean, minimalist touring pants built for year-round riding. A fixed waterproof liner keeps you dry, a detachable 80g thermal liner adds warmth on cold mornings, and an ACTIVE touring fit with pre-curved legs and 3D knees moves with you. CE Level 1 Nucleon Flex Plus knee armor is included.

Note: Follow the pants sizing chart under the fitment tab for the proper fit. These pants run small compared to traditional US sizing. If you want a looser fit we suggest sizing up one.

Complete the Set: These pants are made to match the Alpinestars ST-1 Waterproof Jacket. Click to add the matching jacket.

Optional Armor Upgrades (sold separately): These pants have 3-position knee armor pockets and work with optional hip armor. Click to add:

• Alpinestars Nucleon Flex Pro Knee Protectors (CE Level 2 knee upgrade)
• Alpinestars Nucleon Flex Plus Knee Protectors (CE Level 1 replacement or spare knee armor)
• Alpinestars Bioflex Hip Protectors (CE Level 1 hip)

Construction:

• 600D poly fabric blend with ripstop reinforcements on the inner legs
• ACTIVE touring fit with pre-curved legs and 3D ergonomic knees
• Comfortable crotch construction and fixed mesh liner

Waterproofing & Warmth:

• Fixed waterproof liner
• Detachable 80g thermal liner with zipper connection

Protection & Safety:

• CE Level 1 Nucleon Flex Plus knee armor included
• 3-position color-coded knee armor pockets
• CE certified riding garment to EN 17092-4:2020, Class A

Pockets:

• Two ergonomic zippered front pockets

Great for: year-round touring, commuting and riding in wet or cool weather.

Part Numbers:
Manufacturer: Black: S-3220525-10-S, M-3220525-10-M, L-3220525-10-L, XL-3220525-10-XL, 2XL-3220525-10-2XL, 3XL-3220525-10-3XL, 4XL-3220525-10-4XL
P/N: Black: S-2855-0685, M-2855-0686, L-2855-0687, XL-2855-0688, 2XL-2855-0691, 3XL-2855-0692, 4XL-2855-0693