The best waterproof MTB socks add a barrier between your feet and water that gets into your shoes. They are particularly useful if you ride flat pedals, regularly push through wet grass or want to keep using familiar trail shoes through autumn. Sealskinz Billockby is our overall choice for its cycling-specific, lightweight construction; Altura is the lower-cost starting point.
Fit matters as much as waterproofing. A membrane sock needs enough room inside your shoe to avoid squeezing your toes, while its cuff height and insulation should suit the rides you actually do. The best waterproof MTB socks balance that protection with comfort when you are working hard on a climb.
best waterproof MTB socks shortlisted
Best overall: Sealskinz Billockby Waterproof Mid Length Lightweight Cycling Sock — £35.70 (RRP £42)
Altura Waterproof Socks — £21.99 (RRP £35)
Fox Defend Waterproof MTB Socks — £26.99 (RRP £44.99)
Bridgedale StormSock Midweight Boot — £32.99 (RRP £40.99)
Sealskinz Bircham Waterproof All Weather Ankle Length Sock — £37
For everyday socks without a waterproof membrane, see our best MTB socks guide. If you also need different footwear, start with the MTB shoes guide before adding thickness inside a shoe that is already too tight.
The best waterproof MTB socks
Sealskinz Billockby Waterproof Mid Length Lightweight Cycling Sock
Best overall for wet trail rides
£35.70 (RRP £42)
The Billockby is our first choice for riders who want a waterproof barrier without deliberately adding a heavily insulated winter sock. Its cycling-specific design combines the Aquasealz membrane with a bamboo-based inner, arch support and hand-linked toe seams. That makes it a sensible starting point for wet autumn rides in the shoes you already like.
Its appeal is the balance of coverage and a relatively light construction, rather than maximum warmth. Check the fit inside your riding shoes before committing to a long ride, and remember that water can still enter above the cuff. Choose the Bridgedale below if cushioning and colder conditions matter more than keeping bulk down.
Pros
Cycling-specific lightweight construction
Arch support and hand-linked toe seams
Cons
Not the warmest option for prolonged cold
Specifications
Three-layer construction with Aquasealz waterproof membrane
Nylon outer and bamboo-based inner
Mid-length coverage
Altura Waterproof Socks
Best budget option
£21.99 (RRP £35)
Altura offers an accessible way to try waterproof socks before replacing a perfectly serviceable pair of MTB shoes. The Rainguard membrane sits between a polyester outer and a rayon-and-wool mixed lining, with shaping and a ribbed cuff to keep the sock in place. Seamless heel and toe construction is a useful detail where a riding shoe already fits closely.
This is the straightforward value recommendation for riders trying waterproof socks without spending as much as the premium options. The membrane is not a substitute for checking shoe volume: an affordable sock stops being good value if the extra thickness makes your toes cramped. Try the combination with your usual riding shoes before committing to a long outing.
Pros
Lowest-priced option in this selection
Seamless heel and toe
Cons
No guarantee against water entering over the cuff
Specifications
Rainguard waterproof membrane
Polyester outer; rayon/wool mix liner
Ribbed cuff and shaped knit
Fox Defend Waterproof MTB Socks
Best MTB-specific alternative
£26.99 (RRP £44.99)
Fox’s Defend Waterproof socks use a three-layer construction with a polyurethane membrane and flat-stitched toes. They are designed around mountain-bike use, with an outer intended to withstand dirt and debris. They are a sensible alternative if you want a dedicated trail sock rather than an outdoor boot sock.
As with every sock here, the waterproof claim applies to the covered fabric, so a deep crossing that overtops the cuff can still leave your feet wet.
Pros
Dedicated MTB design
Flat-toe stitching
Cons
Membrane does not seal the open cuff
Specifications
Three-layer construction
Polyurethane waterproof membrane
Unisex sizing
Bridgedale StormSock Midweight Boot
Best for cushioning in colder conditions
£32.99 (RRP £40.99)
The StormSock Midweight Boot is the option to consider when a lightweight waterproof sock leaves too little cushioning or insulation. Its waterproof, breathable construction and boot-height coverage are intended for extended outdoor use. For mountain biking, that makes most sense with a roomier trail shoe or winter boot.
The trade-off is space. A midweight sock can be the wrong answer in a narrow summer shoe, even if the weather is cold, so check that you can still move your toes comfortably. This is our cushioning-led choice for riders whose footwear has enough volume, rather than a universal upgrade for every flat or clipless shoe.
Pros
Midweight cushioning
Useful coverage with roomier footwear
Cons
Greater bulk needs shoe space
Specifications
Waterproof, breathable membrane construction
Midweight; boot height
Unisex outdoor design
Sealskinz Bircham Waterproof All Weather Ankle Length Sock
Best for a shorter waterproof cuff
£37
The Bircham suits riders who prefer ankle-length coverage to a taller waterproof sock. Its midweight construction combines an Aquasealz membrane with a merino-blend lining, so the shorter cuff does not mean an ultra-thin summer fit. Allow enough space inside your shoes for that extra material.
Choose it for a lower cuff rather than maximum protection up the leg. Water can still enter over the top, particularly in deeper puddles or when runoff reaches an exposed ankle. Riders wanting more coverage should start with the Billockby or Bridgedale instead.
Pros
Lower cuff for riders who prefer ankle socks
Merino-blend inner
Cons
Lower cuff is easier to overtop
Specifications
Aquasealz waterproof membrane
Lining: 36% merino wool, 36% acrylic, 18% polyester, 5% nylon, 5% elastane
Ankle length; midweight construction
How waterproof MTB socks work
A waterproof sock normally sandwiches a membrane between an outer textile and an inner lining. The membrane resists liquid water while allowing moisture vapour to pass through. Protection covers the part of the foot and leg inside the sock, while footwear still needs enough room for a comfortable fit.
That open top is the weak point in every waterproof sock system. Water running down a bare leg, or a stream deeper than the cuff, can get inside even when the membrane is intact. A taller cuff provides more coverage but is not a sealed wading system; arrange waterproof trouser hems over the cuff so runoff is directed outside.
Flat pedals, clipless shoes and fit
Waterproof socks work with either pedal type because they sit inside the shoe. They avoid putting a fabric overshoe sole between flat-pedal pins and your normal rubber tread. They also avoid the exposed underside of many overshoes when you need to walk, although your shoes themselves can still become wet and muddy.
Fit matters more than the label on the pedal. Check toe room, heel security and the position of any seams with the shoes fastened normally. A thicker sock that squeezes the forefoot is a poor choice, and buying an oversized sock can introduce folds. Use the manufacturer’s chart for the exact model rather than assuming all medium sizes are equivalent.
Warmth, breathability and cuff height
For mild, wet autumn rides, start with a lighter construction such as the Billockby. For slower rides in colder weather, a more cushioned option can be useful if there is room inside the shoe. Waterproof and warm are separate properties: a membrane does not make every sock a winter boot substitute.
Breathable does not mean your feet cannot get sweaty. Adjust the rest of your clothing for the effort and conditions, and choose ordinary socks on days when water protection is unnecessary. Our waterproof MTB trousers guide helps with the other half of the runoff problem, while eMTB mudguards can reduce some of the spray reaching your footwear.
Care after a muddy ride
Follow the washing and drying instructions for your exact socks. Remove grit before it is ground into the fabric, avoid aggressive stretching when taking them off and let them dry thoroughly before storage. Do not assume that the drying temperature permitted for an ordinary cotton sock is suitable for a waterproof membrane.
Frequently asked questions
Will waterproof socks keep my shoes dry? No. They sit inside the shoe and protect the area they cover; the shoe can still absorb water. Dry your footwear as well as the socks after riding.
Should I wear another sock underneath? Only if the manufacturer allows it and the combination fits comfortably. An extra layer adds bulk and can create folds; waterproof socks with an inner lining are normally designed to be worn against the skin.
Are more expensive socks always better? No. Choose the construction and thickness that fit your footwear and conditions. A lighter model that fits properly can be more useful than an expensive insulated pair that crowds your toes.
Verdict: choosing waterproof MTB socks
Sealskinz Billockby is our overall pick for wet trail rides where a lighter waterproof layer makes sense. Altura provides the lower-cost starting point, while Bridgedale suits riders prioritising cushioning in roomier footwear. The best waterproof MTB socks are ultimately the pair that fit your shoes without squeezing your feet; choose that fit before adding insulation or cuff height.