Run better. Feel the difference.
Blister-resistant, arch-support compression, cushioned without the bulk. One sock, built properly, in the UK.
Built here. Backed to go the distance.
Proper running socks, made with proper promises.
Designed & made in the UK
Knitted in Britain. Never imported.
30-day comfort guarantee
Run in them. If they are not right, send them back.
12-month hole guarantee
Holes in a year? We replace them.
Family run in Hertfordshire
Built by runners, for runners.
Bestseller
One sock. Five colourways.
We do not do ranges. We do one sock and we get it right — then we let you pick the colour.
Engineered where it hurts
A seamless toe and a low-friction knit so nothing rubs at mile twenty.
A band across the midfoot that holds the sock still inside the shoe.
Targeted padding under the heel and ball. Thin everywhere else.
Mesh venting over the instep keeps feet dry on long, warm efforts.
Ultras, Ironman, wet Hertfordshire bridleways. Then changed and tested again.
Most runners buy three
Rotate a pair a day, wash less often, replace less often.
Runners on SEDZ
Used these for an ultra event - No rubbing, no pressure points and zero blisters. The compression around the arch feels really supportive and they are so comfortable! would certainly purchase again.
Verified buyer
Absolutely fantastic!! To be able to train for an Ironman and run 32k blister free is priceless. My feet are in top condition and ready to train again tomorrow.
Verified buyer
These socks are absolutely awesome. Survived a full distance triathlon without issues. Very soft. Great fitting (I'm size 13!). Superb value for money.
Verified buyer
Never thought I'd be hyping up socks, but here we are… these are unreal. Do exactly what they say and my feet are seriously thanking me.
Verified buyer
Made here. Answered here.
Founded by ultrarunner and Ironman athlete Tom Seddon, SEDZ started with one question: why is it so hard to find a running sock that just works? Years of miles later, we are still a family business — designing every pair in Hertfordshire, making them in the UK, and answering every email ourselves.
Train, fuel, recover
Winter running in the Chilterns: our 12-week base plan
How we build winter fitness on Hertfordshire trails, with friends, without burning out.
Training
Road to trail: what changes
Stride, hills, strength and kit. How to move off tarmac without picking up an injury.
Athletes
Irondad
From complete triathlon beginner to four Ironman finishes, while bringing up small children and working full time. Plus the training plan I...
Proper running socks, made with proper promises.
30-day comfort guarantee
Run in them. If they're not right, send them back within 30 days. No quibbles, no hassle.
12-month hole guarantee
Every pair is covered by our year-long hole-free guarantee. If a hole develops within 12 months, we'll send you a replacement pair.