Alpinestars ST-1 Waterproof Pant
The ST-1 Waterproof Pants are perfect for riders who need reliable, all-weather protection paired with Alpinestars’ ergonomic design. Constructed from tough 600D poly fabric with poly ripstop reinforcements on the inner legs, these pants provide a balance of durability and flexibility. The sleek, streamlined design delivers a modern look and comfortable fit, especially in rainy conditions. Featuring a detachable thermal liner for added warmth on cold mornings and evenings, the ST-1 Waterproof Pants are an excellent choice for adventure touring riders seeking versatile, minimalistic gear that offers year-round performance.
- 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
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Sizing Information
These pants are sold in US Alpha sizes and Alpinestars offers a chart to estimate the waist size for each size. The conversion estimates are about what you’d expect for each US alpha size and we verified the estimates on several pair and found them to be pretty accurate. (Note: Prior to 2018 product releases, Alpinestars standard size charts indicated waist sizes that were significantly larger than those listed here and we had to provide our own estimates on size. Now Alpinestar’s chart more accurately reflects actual size.)
To help you get the right size, we’ve condensed Alpinestars rather complicated chart to something more easily readable. Please note that we are listing a waist size range for each pant because the pants have an adjustable belt at the waist that allow you to snug them down if needed. Choose a size based on the measurement of your waist. You’ll want to measure yourself up a bit higher on your waist than ordinary jeans because protective pants like this are a little higher waisted. Take the link below if you need advice on how to measure. Though the materials of these pants are somewhat stretchy and forgiving, I’d advise you to choose larger if you find yourself between sizes.
| Alpha Size | Alpinestars Waist Size Estimate |
Measured Inseam |
|---|---|---|
| Small | 30 to 31.5 | 30.5 |
| Medium | 31.5 to 33 | 31.5 |
| Large | 33 to 34.5 | 33 |
| XL | 36 to 37.5 | 33.5 |
| XXL | 38 to 39 | 34.5 |
| XXXL | 41 to 42.5 | 35 |
| XXXXL | 42.5 to 44 | 35 |
| XXXXXL | 45.5 to 47.5 | 35 |
