Fly over trails in the waterproof, breathable women’s REI Co-op Flash hiking boots that are comfy right out of the box. REI-exclusive technologies create fast-and-light boots—with a lighter footprint.
Features
- Strong and socklike FirmaKnit™ uppers are made from 99% recycled PET polyester and are designed for lightweight yet durable comfort right out of the box
- HydroWall™ complete waterproof/breathable protection keeps your feet dry when the trail ahead isn’t—and uses 75% recycled polyester to do so
- 20% recycled rubber TerraGrip™ tread provides anti-slip grip on all kinds of terrain with 4 mm forefoot climbing lugs for going up and 4 mm heel braking lugs for coming down
- TerraLoft™ midsoles use 10% algae-based BLOOM™ foam to cradle your feet with a cushioning system that feels like your favorite trail-running shoes (soft, but not too soft)
- TrailBed™ insoles use Insite® Contoura® technology created with podiatrists to ensure support and comfort; plus, it’s made with 25% USDA-certified bio-based Susterra® compound
- 2-layer 30% recycled TPU overlays are designed to create durable and supportive uppers—the structure you need for long hours on the trail that’s still light and minimalist
- Molded nylon midfoot shanks provide lightweight support to protect your feet from the trail and help propel you forward
- Recycled PET polyester webbing and lacing creates a midfoot cradle system that allows for a highly adjustable and locked-down fit
- Extra space in the toe boxes allows for natural changes in your feet (like swelling) during hours of trail exploration
- Informed by feedback from over 6,000 people and field tested by 100 co-op members over 2,000 hours and 700+ miles
Imported.
Technical Specs
| Best Use |
Hiking |
|---|---|
| Footwear Height |
Over-the-ankle |
| Footwear Closure |
Lace-up |
| Waterproof |
Yes |
| Type of Waterproofing |
HydroWall™ waterproof/breathable membrane using 75% recycled polyester |
| Upper |
99% recycled PET polyester FirmaKnit™; 30% recycled thermoplastic urethane (TPU) overlay |
| Midsole |
TerraLoft™ EVA using 10% algae-based BLOOM® foam |
| Support |
Molded nylon midfoot shank |
| Outsole |
TerraGrip™ rubber (20% recycled) |
| Vegan |
Yes |
| Weight (Pair) |
1 lb. 13 oz. |
| Gender |
Women’s |
| Sustainability |
Contains recycled materials |
Size Chart
| 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| U.S. Women’s | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 |
| UK | 4 | 4.5 | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 |
| EU | 37 | 37.5 | 38 | 38.5 | 39 | 40 | 40.5 | 41 | 42 | 42.5 | 43 |







































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