What To Wear Under A Motorcycle Jacket In Summer And Winter

Knowing what to wear under a motorcycle jacket makes a real difference to how warm, dry and comfortable you feel on the bike. It also affects how well the jacket protects you, because whatever you put underneath changes how the armour sits. This guide covers base layers, mid layers, summer and winter set-ups, and the everyday clothes that are best left in the wardrobe.

Why Layering Under A Motorcycle Jacket Works

Layering means wearing several garments that each do one job, rather than relying on one thick item. The layer next to your skin keeps you dry, the middle layer holds in warmth, and the outer layer (your motorcycle jacket) keeps out wind and rain.

The big advantage is flexibility. You can add or remove a layer as the temperature changes, which suits UK riding, where a cold morning can turn into a mild afternoon. It also means one good jacket can work across more of the year.

Choosing A Base Layer

The base layer sits against your skin. Its job is to draw sweat away from your body so your skin stays dry, because damp skin chills quickly once the wind gets at it on a moving bike.

Two types of fabric do this well:

• Merino wool: it combines wicking with some water repellence, and it resists odour, which helps on long days or trips where you wear the same top twice.
• Synthetic sports fabrics: base layers made for active wear are designed to wick sweat away from the skin in the same way.

Pick a base layer that fits close to the body without feeling tight. Loose, baggy fabric bunches up under the jacket, while a smooth, snug layer lets the jacket sit as its maker intended. Long sleeves and full-length leggings are worth having for cooler months, as they cover your arms and legs under jacket and trousers.

Mid Layers For Warmth

The mid layer is the insulating layer. On a cold day it traps warm air close to your body, and you can choose its thickness to suit the weather.

Good options include:

• A thin fleece or wool jumper for cool spring and autumn rides.
• A lightweight insulated gilet or jacket with synthetic filling for colder days.
• Two thin layers instead of one thick one, so you can take one off at a stop if you warm up.

Keep the mid layer slim. A bulky jumper might feel cosy at home, but squeezed under a close-fitting jacket it can restrict your movement and push the armour away from where it should be.

How Layers Affect Fit And Armour

Most motorcycle jackets carry impact protectors at the shoulders and elbows, and many have a pocket for a back protector. These only work if they stay in position. Fitting advice from UK motorcycle retailers is that armour should sit correctly on the body and not shift when you lift your arms or lean forward into a riding position.

That is why it pays to try a jacket on while wearing the layers you normally ride in. A jacket that fits well over a T-shirt may be too tight over a base layer and fleece, and one that is roomy enough for winter layers may let the armour slide about in summer. Watch for these warning signs:

• Too tight: pinching across the shoulders or chest, or restricted movement when you reach for the bars.
• Too loose: armour moving off your elbows or shoulders, the jacket riding up while seated, or fabric flapping in the wind.

Many jackets have adjusters at the arms and waist. Use them to take up slack when you are wearing fewer layers, so the armour stays where it belongs.

What To Wear Under A Motorcycle Jacket In Winter

For cold weather riding, build up in three stages: a wicking base layer, one or two warm mid layers, then your jacket with any thermal liner zipped in. Cover your legs as well, with thermal leggings under your motorcycle trousers.

A few extra touches help on winter rides:

• A neck tube or snood to stop cold air running down inside your collar.
• Thin liner gloves under your riding gloves, provided your hands can still work the controls properly.
• Warm, wicking socks inside your boots, avoiding anything so thick that your boots feel tight.

Cold, wet riding also calls for extra care with the bike itself. Our winter motorcycle riding tips cover the road side of things.

What To Wear Under A Motorcycle Jacket In Summer

In warm weather the aim changes from holding heat in to letting sweat out. A thin, wicking short or long-sleeved base layer is usually enough. It keeps sweat off your skin and stops the jacket lining sticking to you.

Resist the temptation to ride in just a T-shirt with the jacket left at home. THINK!, the government road safety campaign, advises bikers to wear a protective jacket, gloves, boots and trousers, and points out that even a minor fall can leave you seriously hurt because tarmac quickly wears through everyday clothes. Open the jacket vents, remove the thermal liner and choose a lighter, well-ventilated jacket for hot days instead.

Being seen matters in every season too. The Highway Code rules for motorcyclists recommend light-coloured or fluorescent clothing in daylight and reflective clothing or strips in the dark, so a bright outer layer or vest over your jacket is a sensible addition.

What To Avoid Under A Motorcycle Jacket

Some everyday clothes work against you on a bike:

• Cotton T-shirts and sweatshirts: once cotton gets wet, it stays wet and loses its insulating value. Sweat or rain soaking a cotton layer leaves you cold for the rest of the ride.
• Hoodies: they are usually cotton, they are bulky enough to push armour out of place, and a hood bunched up under your collar is uncomfortable for the whole ride.
• Thick, chunky jumpers: they restrict movement and make a well-fitting jacket too tight.
• Anything loose or trailing: scarves and loose ends can flap about in the wind, so tuck them in or swap for a snug neck tube.

A hoodie or denim jacket is no substitute for a proper motorcycle jacket either. If you are wondering about denim, see our guide on whether denim is good for a motorcycle jacket. For what the law requires and what is simply recommended, read our guide on whether you need to wear gear on a motorcycle.

Quick Checklist

• Start with a close-fitting merino or synthetic base layer, never cotton.
• Add a slim fleece, wool or insulated mid layer when it is cold, and take it off when it is warm.
• Try your jacket on with your usual riding layers and check the armour stays on your shoulders and elbows.
• Use the jacket’s adjusters to take up slack in summer.
• Leave hoodies, cotton sweatshirts and bulky jumpers at home.
• Wear something bright by day and reflective at night.

Get the layers right and your jacket will keep you comfortable and protected across more of the year. You will find more practical guides at Beyond The Garden Gates.

Kaan Rassad

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