![Cold Weather Bike Liner Upgrade](http://bernhelmets.com/cdn/shop/files/cold_weather_bike_liner_upgrade_mockup_v6_front_270f4b4b-ac3c-4cb3-9e36-759f2cf15356_{width}x.png?v=1714279777)
Cold Weather Bike Liner Upgrade
![](http://bernhelmets.com/cdn/shop/files/all-season-logo.png?v=2475605475510130774)
Regular price
$29.99
![](https://cdn.shopify.com/s/files/1/0027/9379/9739/files/product_image.png?v=1625660316)
Product Description
When the temperatures drop, stay warm with Bern's Cold Weather Bike Liner. Designed to keep you warm under your bike helmet without making it feel like you're adding a ton of layers. Comes with a helmet bag and sticker kit.
![](https://cdn.shopify.com/s/files/1/0027/9379/9739/files/bern_mantra_2022_option4_1.png?v=1679509837)
Fit Size | S | M | L |
---|---|---|---|
CM | 52 - 55.5cm | 55.5 - 59cm | 59 - 62cm |
Hat Size | 6 1/2 - 7 | 7 - 7 3/8 | 7 3/8 - 7 7/8 |
MIPS Brain Protection System
![MIPS Brain protection rotational effects of helmet MIPS Helmet rotational protection eases the impact on the brain, preventing concussions](https://cdn.shopify.com/s/files/1/0027/9379/9739/files/MIPS-Left.png?v=1592511489)
![MIPS Brain protection effects on the brain MIPS protects the brain](https://cdn.shopify.com/s/files/1/0027/9379/9739/files/MIPS-Right.png?v=1592511489)
Rotational motion can cause brain injuries. The low friction layer allows a sliding movement of 10-15 mm in all directions, reducing rotational motion to the brain during impact.