We spend months thinking about how to get our feet through an ultra - the right shoes, the perfect sock system, the anti-blister routine. But far fewer of us think about what happens the moment we stop. That's a mistake. How you look after your feet in the hours and days after an ultra can make a huge difference to how quickly you're back out running.
Here's how to look after your feet properly so you can return to running sooner, foot pain-free.
What an ultra does to your feet
Running an ultra wreaks havoc on your feet. If you haven't experienced it yet, here's what you're in for! Your feet swell (sometimes a full shoe size) from the hours of pounding. Your skin, softened by sweat and water crossings, turns fragile and prone to blistering and maceration (that pale, wrinkled, waterlogged look). Long descents drive your toes into the front of the shoe, bruising your nails until they blacken. And underneath it all is a deep, cumulative fatigue in your arches, metatarsals and plantar fascia - the toll of thousands of small impacts adding up.
The good news is all of it responds well to a bit of care in the right window.
The first hour: get out of your shoes
The single most useful thing you can do happens in the first hour and it's the thing most of us skip because we're wrecked, cold and hunting for food.
Get your shoes and wet socks off. Skin that's been sealed inside a damp shoe for twelve hours needs air more than anything else. Leaving it in there is what turns soft, macerated skin into a blister or a nail bed problem. Wipe your feet down, get them properly dry (between the toes especially) and swap into something clean and dry.
Ideally, don't go barefoot on a hard floor. Your feet are swollen and every pressure point is raw, so you want something soft, supportive and easy to slide into without touching the sore spots. We recommend bringing with you a Recovery slide like Enertor's Recovery Slides which are wide fit, have arch support to soothe your aching feet and absorb a lot of impact.
Manage the swelling early
Post-race foot swelling (oedema) is normal - it's fluid pooling after hours of impact and being on your feet. You can help it settle by elevating your feet. Get your feet up above heart height for 15–20 minutes when you can, especially the first evening. This is the highest-value, lowest-effort thing on the list.
The following day, you should also try and move a little. Get out for a slow flat walk. It's also worth trying to do some ankle circles and calf raises to pump fluid back out through the muscle-pump mechanism.
Most swelling settles within a few days. If one foot stays significantly more swollen, hot or painful than the other, get it checked. That's not standard post-race soreness.
Blisters: drain, don't deroof
The current physio and medic consensus is simple: if a blister is intact and not painful, leave it alone. The roof of a blister is a sterile dressing your body made for free. If it's tense, painful or over a pressure point you'll keep loading:
1. Clean the skin and a needle (an alcohol wipe on both).
2. Pierce at the edge, low down, so gravity drains it. Make two small holes if it keeps refilling.
3. Leave the roof on. Deroofing exposes raw dermis and multiplies infection risk and pain.
4. Dress it. A hydrocolloid plaster is the go-to for weight-bearing areas.
Watch for spreading redness, heat, throbbing or pus over the following days. That could be an infection which needs a GP, not another plaster.
Skin and nails: air it out and leave the nails alone
That waterlogged, wrinkled skin (maceration) recovers on its own once it can dry out and breathe - so the fix is airtime, not creams. Keep feet clean and dry, wear open or breathable footwear at home (Like an Enertor Recovery slide) and give the skin a day or two before you seal it back into trainers.
Blackened toenails are bruising under the nail. If there's throbbing pressure in the first 24–48 hours, a GP or podiatrist can relieve it. If it's not especially painful, leave it: don't pull the nail off, even when it starts to lift. Let it grow out and detach naturally, just keep it trimmed and clean while it does. Yanking a loose nail is a fast route to an infected nail bed.
Wake the arches and plantar fascia back up gently
Your arches, metatarsals and plantar fascia have absorbed a colossal number of impacts, and they'll feel bruised and tight, particularly on your first steps out of bed. The instinct is to attack them with aggressive stretching and a hard massage ball. Resist that for the first day or two - angry, fatigued tissue doesn't want to be hammered.
Instead, we recommend rolling them gently with a massage ball for just a couple of minutes. Also make sure you support your feet when you're up and about. This is the part people miss. Every barefoot step on a hard kitchen floor asks a fatigued arch to do the shock-absorbing your recovering tissue would rather skip. Keeping the foot supported and cushioned in those first few days lets the plantar fascia settle instead of getting re-loaded with every trip to the kettle. We recommend putting Enertor insoles in your shoes to absorb impact if you go out walking. They also give your arches some subtle support.
Ease back into running (your feet will tell you when!)
Your cardio might feel recovered before your feet do. Let the feet lead the timeline:
· Walk before you run. Comfortable, pain-free walking with a normal gait is the green light. If you're still limping or favouring a foot, you're not ready.
· Let blisters, nails and skin close over first. Running on raw or infected skin sets you back further than a few extra rest days ever will.
· Start short and flat. Your first run back is a systems check, not a session. Keep it easy, keep it flat, and stop if a specific spot starts talking to you.
A dull, even, all-over stiffness that fades as you move is normal recovery. A sharp, specific, localised pain at one point on the arch, heel, or a metatarsal that gets worse with loading is not. That's your cue to rest it and see a physio.
The takeaway
Look after your feet after your next ultra and you'll be back running again sooner. Ignore them, and they'll decide when you run next - not you.
Recovering from a big race or deep in a training block? Enertor Recovery Slides give tired, swollen feet the cushioning and support they need once the running stops.