Desafio four

Desafío Four is an H4 trail running sock with a semi-crew height (8 cm above the shoe), designed for mid-distance runs when you need stability, breathability and long-wear comfort. It features an updated sizing approach for a more precise fit inside the shoe—especially on uneven ground and through pace changes.

The construction is made to minimise distractions: no seams around the perimeter and a point-to-point closed toe to reduce rubbing in sensitive areas. Extra +A adjustment at the cuff improves hold without feeling tight, and higher-breathability zones are placed in peak sweat areas to help the foot feel drier. Across the instep, an adaptable anti-slip band helps keep the sock in place and reduces unwanted movement inside the shoe when the trail gets technical.

At the core is Bmax Tetra technology, created to tackle the main blister triggers: overheating, moisture and friction. The structure is built to release sweat quickly and support a cooler feel during high intensity, helping protect the skin over time. Underfoot, ESP 1 plantar structure adds functional protection where the foot works the hardest. As a base, Antiodour Base Layer provides cross-garment antibacterial action for lasting odour control and durability. Developed, patented and locally produced in Ontinyent (València), Desafío Four is built for real trail comfort: stable fit, protected skin and confidence in every stride.