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The two-in-one style will keep your legs warm and toasty in the bitter cold.

When the weather outside is frightful, singing about the joys of snowfall can seem a little obtuse, regardless of what the catchy Christmas bop may say. Winter, for many that have to trek outdoors regularly, is a treacherous season. It is cold, unruly, and could put a damper on your sunny disposition. The best course of action is to prepare in advance and find fits that will protect you from frostbite. Layering is key, and so, too, are insulating, sturdy fabrics. Enter the fleece-lined jean, a two-in-one style that is the safest bet to keep your legs warm and toasty.

The durability of a denim combined with the heat-packing quality of a fiber like fleece is why it is the best jean for winter. Of course, there are also organic flannel-lined options, but these tend to be oversized and are often billed as workwear. Synthetic fleece, on the other hand, comes in a wider range of cuts, from boot cuts to tapered silhouettes, and looks just as good as the standard denim that you have sitting in your drawers. But with the added lining, they are exactly what you need when it’s 10 below and and the cold wind blows. And we have 10 of them just ready for you to sing Christmas carols in, if you so choose.

No need to bulk up this winter when you have these relaxed-fit, fleece-lined jeans by Lee. 

These bonded jeans by Wrangler Authentics are sleek enough for, well, Bond, James Bond. 

With a name like Smith's Workwear, it's no surprise that the brand has durable jeans. But spiffy boot-cut options? Now that's something unexpected. 

Dickies offers a slew of carpenter jeans, but these fleece-lined jeans are categorically the hottest of 'em.

Uniqlo gives us denim at a hard-to-beat price already. But slim-fit jeans with a thin fleece lining at under $50? This is basically a steal. 

It's not a surprise that the brand synonymous with workwear offers fleece-lined denim perfectly suited for, well, working outdoors. 

Come for the fleece lining, but stay for the relaxed fit and cool wash. 

Best believe that with a name like Weatherproof, the brand offers the kind of fleece-lined jeans that are up to snuff no matter what Mother Nature is dishing out. 

The brand synonymous with outdoor style (see its recent collab with Todd Snyder) of course has fleeced-lined options that look just as good on mountain trails as they do on city streets.  

Washington-based  Eddie Bauer has all the fits needed for cold climes, including these sleek, fleece-lined jean.