SEALSKINZ Blofield Anti-Blister Mid Length Running Sock - Black - M

The inner layer stays with your foot, while the outer layer moves with your shoe. This shear force is redirected between the sock layers, not between the sock and your skin, preventing friction that causes blisters.

Yes, they are designed for various running disciplines, including road running, trail running, and ultra-marathons, providing comfort and blister protection across different conditions.

Refer to the Sealskinz sizing guide, typically found on their website or product packaging. A correct fit means the sock is snug but not constricting, with no excess material bunching up.

While primarily designed for comfort and blister prevention, the breathable fabric offers some thermal regulation. For very cold conditions, consider Sealskinz's insulated or waterproof sock ranges.

With proper care, these socks can last for many miles. Replace them when you notice significant wear in the padding, thinning of the fabric, or a loss in their anti-blister performance.

Tactel is a premium polyamide fiber known for its softness, breathability, and lightweight properties, providing a comfortable, second-skin feel.

Ensure you have selected the correct size based on the Sealskinz sizing chart. If the issue persists, try wearing them for a short period to allow the fabric to adapt to your foot.

Double-check that the inner and outer layers are not bunched or folded. Ensure the socks are properly aligned with your foot's contours, especially the left and right specific design. Make sure your shoes are not worn out or ill-fitting.

Ensure the socks are clean and free from residues that can impede moisture-wicking. Avoid using fabric softeners during washing. Consider if the environmental conditions (extreme heat/humidity) are exceeding the sock's intended performance range.