The Grivel Spider is an instep crampon, so it leaves a boot’s toe and heel exposed. The polyamide frame is attached to the shoe with webbing straps and a quick-release buckle. They come in just one size and can be fitted to a wide variety of footwear. Screwed into the frame are 10 metal spikes that are 5mm long, and there’s an additional moulded section that’s also 5mm deep, giving a total penetration of 10mm. This is very useful for crunching through a thin layer of snow to the ice beneath. As the toe and heel are exposed your grip in these areas is totally reliant on the lug pattern of your sole. So use them on boots with a deep lug pattern and they provide a useful extra grip on snow or ice, but on boots with shallow lugs you may find your heel or toe slipping around if you adopt a normal walking action rather than ‘stamping’. Grivel Spiders are useful on soft ground, broken ice and even areas covered in a thin layer of snow with ice underneath. They can feel a bit wobbly on a hard, flat path with a thin layer of ice, though, such as stepped rock paths or concrete.
Materials polyamide frame with 10 steel spikes
Sizes one size
Weight 165g (pair)
Grivel Spiders are useful kit for level, soft ground and tracks where there are areas of snow of ice, but unstable on hard surfaces.
Review by Graham Thompson
First published in Trail magazine February 2014