What Neoprene Lining Adds to Boots on Cold Mornings

Anyone who has pulled on unlined rubber boots at seven on a frosty morning knows the feeling. The rubber is cold to the touch before your foot even goes in, and it stays cold, because rubber on its own does almost nothing to hold heat. Neoprene is the lining people add to fix that, and it does fix a good part of it, but not everything.

What’s Going On Inside the Foam

Neoprene contains thousands of tiny sealed cells. Each cell has a pocket of gas trapped inside that keeps heat inside those pockets for a while. With it, you get the benefit of a thick sock without the bulk. The foam is also a little stretchy. It sits close around the ankle and calf and feels softer against the skin.

Jersey is a better match for damp days. However, neoprene earns its place once the temperature drops toward freezing.

Choosing a Thickness

Most linings fall between 3 mm and 5 mm. A 3 mm lining is enough for the chill, while 4 to 5 mm is the range for hard frosts and long spells standing in the cold. A few boots go further still by adding fleece or a layer of thermal foam under the foot.

Picking the thickest one may seem like a smart move. It’s not. A heavy lining can be a hindrance when brisk walking or doing laborious work. Choose moderate thickness for anything active. Reserve the thick stuff for days of standing around.

Two Things Neoprene Can’t Fix

First, it doesn’t let moisture out. Damp feet because of sweat lose heat much faster than dry ones because moisture undoes the insulation in both the sock and the lining. To prevent this, wearing a pair of socks will pull the moisture away from the skin. The same goes for drying the boots out properly after every wear.

Second, a lot of the cold reaches you through the sole, and the lining around the leg can’t stop that. A thin sole on frozen ground will draw heat out of your feet, however good the neoprene is. The boots that cope best in a hard frost have a thick sole and an insulated footbed on top of the lining, so that’s worth checking alongside the thickness.

Fit Makes or Breaks It

A neoprene lining only works if it keeps its shape. Squeeze it into a boot that’s too tight and the foam compresses, the circulation slows down, and your toes go cold anyway. Thick socks cause the same trouble when they’re crammed into a snug fit. At the other end, a boot that’s too loose lets cold air circulate around the foot and wastes the insulation.

Calf fit is where a lot of people go wrong. Measure the widest part of your calf in the trousers and socks you’ll really wear, and add up to 2 cm if you plan to layer. Women’s Wellington boots often come in several calf sizes, and some have an adjustable gusset that closes the gap at the top, which keeps the warm air in. For foot length, measure in the afternoon, when feet have swollen a little, and bear in mind that many neoprene boots are cut to fit snugly, so going up a size isn’t always needed.

A Few Questions for the Shop

• How thick is the lining for the weather you’ll be out in?
• Is there thermal foam or an insulated footbed under the foot?
• Does the boot come in your calf size, or have an adjustable gusset?
• Is it easy to dry the inside, and does the insole come out?

On cold, damp ground with a steady pace or plenty of standing about, women’s wellington boots with neoprene are hard to beat. On a mild brisk walk, a thinner lining is the more comfortable choice.