Alpinestars AST-1 Pants
- 600-denier fabric construction with PU coating and a water-repelling treatment
- Stretch panels above the knees for superior flexibility
- Waterproof and breathable design with nylon lining and taped seams
- Waist size adjustments
- Reflective piping for increased visibility
- PU injected 3D logos
- Knee protector compartment with foam padding
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Sizing Information
These pants are sold in Alpha sizes and allow for a great deal of waist adjustment. The following chart is an estimate of the best fit based on your US pants size. This fit estimate is assuming you’ll be wearing the pants over underwear only (not over other street clothes). Inseam on the size XL is 33.5” which is “average”. Other sizes were not available for measurement at the time of this writing.
| Alpha Size | US Pants Size |
| XS | 27-29 |
| Small | 29-32 |
| Medium | 32-35 |
| Large | 35-37 |
| XL | 37-38 |
| XXL | 40-43 |
| XXXL | 43-46 |
| XXXXL | 46-49 |
Product Video
Our Two Cents
The AST-1 is a simple textile riding pant that offers protection and comfort for the everyday street rider. The pants are lightweight and comfortable on and off the bike. These pants have a waterproof lining and could even be a good idea for a touring rider. I would recommend these pants for cool to warm temperatures, but I think they will be uncomfortably warm on hotter days. The pants include removable knee padding that can be adjusted to an “upper” or “lower” position to help accommodate different height riders. There is reflective piping running down the legs for increased nighttime visibility. Take the “View Larger Pictures Link” above to see some good closeups of the pants and their features.
