Bridgedale merinofusion trekker socks for men are warm comfortable walking socks for year round use merinofusion technology is a system of wrapping fibres of merino wool with coolmax fibres merino wool is a firm favourite amongst outdoor enthusiasts for several reasons people who find that synthetic materials irritate their skin love natural merino wool because it s soft lightweight and breathable it s far less itchy and irritating to skin than ordinary wool while still being really warm merino