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What is a gilet? And why do you need one?

Best women’s gilets
What is a gilet? We look at this sartorially divisive piece of outdoor kit and explain why it’s the perfect garment for shoulder season (Image credit: Getty Images)

In the shoulder seasons of spring and fall, it can be tricky to get your hiking wardrobe just right on those days when it’s cool, but not freezing, breezy, but not blustery. You want to stay warm, but once you get moving, you don’t want to have to stop to take off your down jacket or fleece jacket when you get sweaty. That said, just a base layer isn’t quite cutting it when it comes to protection from the cool air. You could try wearing a waterproof jacket for light wind protection, but that can get clammy quickly. 

So what can you do? Enter the gilet. What is a gilet, you ask? Meet the versatile, lightweight and vastly underrated piece of outdoor gear that’s ideal for changeable conditions. 

What is a gilet? 

Nobis Elora Ladies Vest

Also known as a bodywarmer or vest, a gilet is simply a sleeveless jacket that is the perhaps the perfect outer garment for the transition seasons (Image credit: Nobis)

Before you check out our guides to the best gilets and the best women’s gilets to uplevel your mud season adventures, here's everything you need to know.

Also known as a bodywarmer (especially if you grew up in the UK in the ’80s) or vest, a gilet is simply a sleeveless jacket that is the perhaps the perfect outer garment for the transition seasons. Pronounced “jee-lay” (gilet is French for vest/waistcoat), this functional item is practically required uniformed for New Englanders. They’re unlikely to turn heads in Colorado, where folks are largely indifferent to them – unless they’re worn with nothing underneath by a rad 1980s ski bro who will definitely get props for this choice – and positively sneered at by fashion-forward New Yorkers. When they’re intended for outdoor use, they’re typically made using fleece or down and while they don’t always get a warm reception, they’re really the perfect answer for those months when a light jacket isn’t enough and a heavy jacket is too much. 

What is the point of a gilet? 

Best gilets

Not only can you lose a little heat through your arms to help regulate your body temperature, your arms and shoulders are free if you end up doing some scrambling (Image credit: Getty)

It’s fair to ask why you’d want a jacket without sleeves, but people wear trousers without legs all time and call them shorts and no one seems to mind. Perhaps the best way to understand the value of this sartorially divisive piece of kit is to imagine yourself taking a brisk hike on a cool spring day. As you stride up the trail in your hiking boots, where do you start to sweat first? Your underarms, right? After a few minutes, that starts to get prickly and uncomfortable so you stop and either tie your jacket around your waist or stuff it in your backpack. You march on but then you start to get goosebumps because now you don’t have a jacket and you’re a little damp under the arms. So you stop and put your jacket back on. This continues on until you reach the summit, by which point you’re wearing a slightly damp jacket on a cold day and you’re too chilly to stop for lunch.

All of this pain and misery could have been avoided if you’d just worn a gilet. It keeps your torso and vital organs warm while allowing your armpits to vent. Not only can you lose a little heat through your arms to help regulate your body temperature as you exert yourself in cool weather, but your arms and shoulders are free if you end up doing some scrambling. Plus, gilets don’t have sleeves so they’re considerably lighter weight than a jacket, and pack down small if you do end up putting yours in your pack. 

How to wear a gilet 

Best gilets

Wear a gilet with a smile because you know you've got function, if not style (Image credit: Getty Images)

First of all, your gilet should have a snug fit in order to actually keep you warm. If it’s loose it won’t do its job, but it also can’t be so tight that you can’t get a layer underneath it.

For hiking and camping, a gilet is best worn over a light, sweat-wicking base layer for a little extra warmth, while you could definitely wear it around town over a T-shirt or sweater (just not in New York City). They’re not waterproof, so they won’t do you much good in a spring shower, but you can easily throw a waterproof jacket over the top since they’re form fitting. 

Better yet, this versatile item can be used while you're on belay at the crag and it doesn't have to be packed away come winter. In fact, you might find that your gilet becomes the perfect mid layer in your hiking layering system on very cold days, so you can have an extra layer for warmth between your base layer and your down jacket but don’t have so many layers on that you can’t bend your elbows. Some trail runners even love the protection of a gilet for cold, winter runs.

Convinced yet? We knew you’d come around. 

Julia Clarke is a staff writer for Advnture.com and the author of the book Restorative Yoga for Beginners. She loves to explore mountains on foot, bike, skis and belay and then recover on the the yoga mat. Julia graduated with a degree in journalism in 2004 and spent eight years working as a radio presenter in Kansas City, Vermont, Boston and New York City before discovering the joys of the Rocky Mountains. She then detoured west to Colorado and enjoyed 11 years teaching yoga in Vail before returning to her hometown of Glasgow, Scotland in 2020 to focus on family and writing.