The Puma GWS is the perfect partner for a winter mountaineering expedition. The Bison GWS takes the standard set by the Puma GWS and pushes it that bit further.
Lorraine McCall began her attempt today at a continuous, self-powered round of the Grahams, a four-month tour of upland Scotland combining walking and bikepacking. If successful, she'll be the first person that we know of to do it.