Wellies don't stretch and they cover half your leg. Here's how to get the fit right first time, and the full Grubs size chart.
Quick answer: wellington boots should feel snug around the heel and ankle, with room to wiggle your toes and a little space in front of them, and the top shouldn't dig into your calf or the back of your knee. Your heel can lift slightly as you walk, but it shouldn't slide up and down. With Grubs boots, buy the same size as your everyday shoes. There's a built-in 15mm allowance for wool-blend socks, so don't size up, and if you're a half size, size down.
Nobody tells you how a welly's supposed to fit. You shove your foot in, stomp about a bit, decide it "feels fine" and three weeks later you've got a blister the size of a 50p. Wellies aren't like trainers. Rubber ones don't stretch, none of them lace up tighter and they cover half your leg. So here's how to get it right first time.
The five-point welly fit check
1. Toes: room to wiggle, not room to swim
You should be able to wiggle your toes freely, with a bit of space in front of your longest toe. Grubs boots are made with a 15mm allowance for wool-blend socks, so the room's already there. If your toes touch the end when you walk downhill, the boot's too small.
2. Heel: a little lift, no slide
Pull-on boots always let the heel lift a touch, because there are no laces to lock it down. A small lift is fine. If your heel slides up and down noticeably, you'll get rubbing and blisters, and the boot's probably too big. Neoprene boots hug the ankle and hold the heel better than a loose rubber shell.
3. Width: snug, not squashed
The boot should hold the widest part of your foot without pressing on your little toe. A boot that's too tight squashes the insulation and slows your circulation, so you get cold feet as well as sore ones.
4. Calf: one finger of space
This is where most wellies go wrong. Measure the widest part of your calf and compare it with the calf width on our size chart below. You want enough room to slide a finger down the inside of the boot top, especially with jeans tucked in. Tall boots that pinch here are miserable. Grubs neoprene stretches by up to 50%, unlike rubber and many other wellies, so our neoprene boots fit wider calves. To get them on, roll the top of the boot down, step in, then roll it back up over your calf. If your calves are on the wider side, have a read of our wide calf and wide fit guide.
5. Height: clear of the back of your knee
Crouch down. If the top of the boot digs into the back of your knee, it'll rub every time you bend, whether that's kneeling in the garden or climbing a stile. If you're on the shorter side or bend a lot, consider an ankle or calf-height boot. Our ankle vs tall wellies guide helps here.
The Grubs size guide
All measurements are in centimetres, taken from our full-length boots.
| UK size | EU size | Insole length | Boot height | Calf width |
|---|---|---|---|---|
| 3 | 36 | 23.6 | 37 | 40 |
| 4 | 37 | 24.2 | 37 | 40 |
| 5 | 38 | 25.1 | 37.5 | 41 |
| 6 | 39/40 | 25.9 | 38 | 41 |
| 7 | 41 | 26.7 | 38.5 | 42 |
| 8 | 42 | 27.8 | 39 | 42 |
| 9 | 43 | 28.5 | 39.5 | 43 |
| 10 | 44/45 | 29.4 | 40 | 43 |
| 11 | 46 | 30 | 40.5 | 44 |
| 12 | 47 | 30.8 | 41 | 44 |
| 13 | 48 | 31.9 | 41.5 | 45 |
To find your size, measure your foot from heel to longest toe and compare it with the insole length. The insole already includes room for socks. See the full Grubs size guide.
Should you size up in wellies?
With Grubs: no. This is the most common mistake we see. People size up "for socks", end up with a boot that slops about and then wonder why their heels are raw. Our boots already allow 15mm for wool-blend socks. Buy your normal size, and if you're a half size, go down. With other brands, check their own advice, because some don't build in a sock allowance.
Grubs boots built for a better fit
- Speyline 4.0: classic bellows at the calf give a great calf fit, with 3mm neoprene, a 6mm NITROCELL™ footbed and a VIBRAM® BRISTOL sole. The footbed is warm enough that you don't need special welly socks, which tend to roll down and rub.
- Highline 2.0: a full rubber welly with a NEOPRENE FLEX-PANEL™ that gives a great calf fit while staying 100% waterproof, plus a 2mm neoprene lining and HEXZORB™ heel.
- Rainline 2.0: lightweight full rubber with the same NEOPRENE FLEX-PANEL™ at the calf, a SUPERDRI™ lining and a NITROCELL™ footbed.
Neoprene-topped boots like the Frostline 5.0 also flex with your leg, which suits a lot of people who find stiff rubber wellies tight. Browse them all in our Outdoor Leisure collection.
Top tips for trying wellies on
- Try them later in the day, when your feet are at their biggest.
- Wear the socks you'll actually wear with them.
- Walk up and down stairs. Toes shouldn't hit the front going down, and your heel shouldn't slide going up.
- Crouch and kneel to check the top of the boot at your calf and knee.
- Pull them on and off a few times. If it's a wrestle every time, they're too narrow at the ankle.
Welly fit questions
Should wellies be tight or loose?
Neither. They should be snug at the heel and ankle with room to wiggle your toes. Too tight squashes the insulation and gives you cold feet. Too loose lets your heel slide, which causes blisters.
Is it normal for your heel to lift in wellies?
A small amount of heel lift is normal in any pull-on boot. Your heel shouldn't slide up and down noticeably, because that means the boot's too big.
Should I size up in wellies for thick socks?
Not with Grubs. Our boots have a 15mm allowance for wool-blend socks built in. Buy your usual size, and size down if you're a half size.
Do Grubs wellies fit wide calves?
Yes. Grubs neoprene stretches by up to 50%, so it fits wider calves. Roll the top of the boot down, step in and roll it back up over your calf. If you prefer rubber, the Highline 2.0 and Rainline 2.0 have a NEOPRENE FLEX-PANEL™ at the calf.
What if I'm a half size?
Grubs boots come in whole sizes, so go down to the next whole size. The sock allowance means you'll still have enough room.
How do I know if wellies are too big?
Your heel slides up and down as you walk, your foot moves forward and back inside the boot, or the top flaps loosely around your calf. All of these cause rubbing.
Found your size? Pick your pair from the Outdoor Leisure range, or check the size guide one more time. We won't judge.