The Essential Gear for Every Condition Designed for hikers and trail runners who want to be prepared year-round, the GR Pack brings together 4 pairs of HYRUN technical socks tailored to different terrains, temperatures, and activity levels. Inside the pack: 1 pair of Merino Wool Crew Socks 1 pair of Merino Wool Quarter Crew Socks 1 pair of COOLMAX® Crew Socks 1 pair of COOLMAX® Low Cut Socks Merino wool provides warmth, natural temperature regulation, and comfort during cooler hikes and mountain adventures, while COOLMAX® fiber delivers rapid moisture management for intense efforts and hot-weather conditions. Each pair is designed to provide: Precise foot support Excellent breathability Reduced friction thanks to the toe separation design Long-lasting comfort over long distances The ideal pack for switching between hiking, trail running, bivouac trips, and long outdoor adventures without ever compromising on comfort.