The short answer? Both Merino Wool and Synthetic fibres are brilliant

Our socks are so comfortable for a reason. Our Merino wool socks have the perfect blend. We combine Merino wool fibres with synthetic fibres. So you get all the benefits.

One of the most debated questions in trail running is whether you reach for merino wool or synthetic socks. We love both, both offer genuine advantages, and both belong in a well-kitted runner's drawer.

At Bridgedale, we have spent decades designing both types of socks. They withstand tough conditions. They work in muddy British fields and during sudden heatwaves. Here's our honest breakdown.

With Over 100 years of experience with Socks, we know what we’re talking about.

Our Bridgedale high performance socks — use blends. The best Merino wool socks use a blend of Merino wool and synthetic fibres. A higher Merino wool percentage does not always mean better performance.

Merino wool is a natural fibre from Merino sheep. Each fibre feels soft on skin.

With it's fine texture, it can absorb up to 30% of its weight in moisture before it feels wet. It also contains lanolin, which naturally resists odour-causing bacteria, something your nose truly appreciates.

Synthetic fibres like nylon, polyester, and Coolmax do not absorb moisture. Instead,
they wick it away from the skin to the sock’s outer surface. They dry fast and are typically more durable than wool alone.

Merino Wool: the flexible sock for all year round.

Merino wool suits unpredictable British weather that can bring sun and sleet in the same hour. Merino is your ally. Its ability to regulate temperature across a wide range makes it remarkably versatile sock.

Choose merino when you're:

• Running in cool or variable conditions (autumn, winter, high altitude)
• Going long — best socks for ultra marathons, all-day, or multi-day fast packing
• Prone to hot spots or looking for a running sock for blister prevention
• Running a route where you'll be on feet far longer than usual
• Packing light and need a sock that stays fresh across multiple days

Summer Runs: Women’s / Men’s Ultralight Merino Performance

Winter Runs: Women’s / Men’s Midweight Merino Performance

Our in between: Women’s / Men’s Lightweight Merino Performance

Synthetic: the sock for warm weather training

For runners racing in summer heat or doing back-to-back training days where gear has to dry overnight — our Coolmax socks are perfect. They're consistent, fast-drying, and engineered to be superior at moisture wicking.

Choose synthetic when you're:

• Racing or doing tempo efforts
• Training in hot, dry conditions — summer trails, that Mediterranean feeling
• Running back-to-back days and need overnight (and fast) dry-out time
• Competing in an event with water crossings (fast dry matters here)

A longer length: Women’s / Men’s Ultralight Coolmax 3/4

Almost invisible: Women’s / Men’s Ultralight Coolmax Low

We engineer these with Targeted Cushioned Zones, reinforced heels and toes, and an Anti Debris Cuff. This helps you move with ease and comfort on any terrain. Understand the features here.

At Bridgedale, we believe the best sock is the one that disappears on your foot. You stop thinking about it after two miles. Our
comfort helps you reach your destination.

Still can’t decide keep a pair of each.

Drinking enough water sounds obvious, but it’s one of the most overlooked parts of staying healthy.

Good hydration supports:

• Energy and focus
• Digestion
• Physical performance
• Overall well being

A small daily habit — but one that can make a surprisingly significant impact on the trail.

Understand the features of our trail run socks👉

Your feet do a lot of work, you need socks that keep you running, walking, and cycling.

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