Jack Wolfskin Infinite LS Base Layer

With a history steeped in outdoor gear, it’s no wonder that Jack Wolfskin can come in hot with a solid base layer for all types of cold-weather activities. With a brushed interior and smooth exterior, the Jack Wolfskin Infinite LS Base Layer has been a great partner for winter trail running.

Jack Wolfskin Infinite LS Base Layer Features:

• Nanuk Dynamic X-Lite fabric
• Structured fleece lining and smooth exterior
• Ribbed design to maximize both warmth and breathability
• Bluesign certified
• 95% polyester and 5% elastane
• Weight: 150 g (medium, actual)
• MSRP: $49.95

Infinite LS delivers comfort and warmth

In the past few years, base layer construction has ramped up in sophistication and capability. A single-blend fabric on the face and interior has long been the standard for base layers, but new developments in fabric construction allows Jack Wolfskin and others to deliver a base layer that has a ribbed, brushed fleece interior with a smooth exterior. On top of that, the Infinite LS also features flat seams. If you are looking for the best of modern base layer construction, this one is it.

If I haven’t sold you on the fabric construction just yet, let me take this to the next level. Have you ever had a base layer that felt like it was stuck to your body? That terrible feeling when you have to “peel” it off after a long activity isn’t super fun, is it? With the brushed backing, the Infinite LS doesn’t ever feel painted on — even though it fits appropriately snug. 

So, along with the ribbed and brushed interior, you also get supreme warmth and breathability. The channels maintain open space to create a micro-environment where warmth is maintained and moisture is evaporated outward. Combined with a highly-breathable outer layer, like the Rab Kinetic 2.0 or the Sugoi Alpha Hybrid Jacket, you can expect the ultimate breathability possible. I’m sure the fabric can get completely saturated under the right conditions, but I’ve never been able to get it to that point. And, due to those interior channels, it dries out impressively-fast after a good trail run.  

The fit and cut of the Inflite LS is just right. The hem and sleeve lengths are outstanding for proper coverage. If the sleeves were a little longer and had thumb loops, I would have kissed Jack Wolfskin designers on the lips, but I’ll have to save those for later. Still, I’m stoked at the sleeve length. The crew-style collar sits nicely and stretches easily to put this one on/off. 

While the ribbed design does optimize performance, it’s not super kind to my dad bod. I tend to add about 5 lbs. during winter and this one reminds me just where that weight has gone. But, maybe that gives me more inspiration? 

Fit: I’m 5’11” and 175 lbs, wearing the size medium.

The Good

• So soft next-to-skin
• Modern construction maximizes comfort and performance
• Breathes and dries in spectacular fashion
• Smooth face fabric slides underneath any jacket or mid-layer 
• Flat stitching will work well with backpacks
• Super stretchy

The Bad

• I would love thumb loops
• Holds a little bit of body odor

The Bottom Line: Jack Wolfskin Infinite LS Base Layer

Jack Wolfskin has just about nailed it with the Infinite LS Base Layer. I really appreciate the cozy comfort and supreme breathability it offers. And, the same construction that makes it so breathable also gives it added warmth. It’s easy to love this base layer for any type of cold-weather activity.

Buy Now: Available from JackWolfskin.com