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Here's what other sites are saying:
Grivel Spider Crampon FEATURES of the Grivel Spider Crampon Made from Polyammide steel Fits all sizes
A ten-pointed polyamide structure, which does not require adjustment to adapt to any type of shoe, in any size. Properly used, the Spider will provide an important margin of safety to the trekker who finds himself on snow, iced-over trails, wet grass and heather or simply hiking on steep, muddy terrain. While helpful to hunters and mountain photographers, Spiders are especially useful to professionals who encounter snow and ice on a daily basis in winter: park rangers, loggers and snow-making, equipment operators at ski resorts. Mountain Rescue Teams will appreciate the fact that Spiders may be adjusted to any shoes without tools. The two parts fit together for transport with the points facing inwards for safety. CAUTION: the Spider is not a crampon designed for alpinism.
- Vargo Outdoors
The Spider is a superlight polyamide and steel instep crampon that may be attached to any boot or shoe regardless of size, without tools. Though not as technical as Gripper the Spider will likely be purchased and carried when the more expensive, heavier Gripper is too much. Spider may be used by hikers, hunters, firefighters, UPS drivers, alpine rock climbers (they will fit on rock shoes), soldiers, snow-making teams or anyone that needs to improve the security of their footwear when facing a variety of slippery conditions.
- Altrec Outdoors