Core-spun construction wraps merino wool around a synthetic core, combining wool's natural warmth and moisture management with the durability of engineered fibers. Giro's HRc+ Merino Wool Sock uses this approach with Meryl Merino yarn to create a mid-weight sock that handles temperature swings across training conditions. The 30% merino content provides warmth when the weather drops, while the polyamide and elastane base maintains structure and stretch through repeated wear and washing cycles.

The HRc+ sits in that useful middle ground between thin summer socks and heavy winter options. The compressive fit promotes circulation and keeps the sock locked in place during hard efforts, while integrated arch support adds stability inside the shoe. Reinforced toe and heel panels address high-wear zones where cheaper socks tend to fail first. Meryl Skinlife fibers work alongside the merino to wick moisture away from skin and maintain natural bacterial balance, which helps manage odor across multi-day trips or back-to-back ride days when you might be wearing the same pair twice.

The 7" cuff height provides coverage that works with current road and gravel kit trends, offering both warmth protection and a consistent visual line with leg warmers or taller socks from your rotation. If you're looking for a single sock that handles shoulder-season road rides, cool-weather gravel days, and mountain bike outings without overheating or leaving your feet cold at the start of a climb, the HRc+ covers a lot of ground in one package.