Klim Aggressor 3.0 Shirt - Black

I picked up the Klim Aggressor 3.0 as part of my colder weather layering system (I've already got several Klim baselayers), and it’s become one of the most useful pieces in my kit - I'm actually sat in my office typing this now wearing it! It’s properly warm without feeling bulky or restrictive, and it pairs perfectly with the rest of the Klim layers. The material feels high quality straight away and does a great job of trapping heat while still letting moisture escape, so you don’t get that clammy feeling when you’ve been riding for a while. Fit is spot on too - snug enough to work as a proper base layer but not so tight that it’s uncomfortable.

Out on the road it makes a noticeable difference. I tend to wear this under my Latitude jacket and perhaps with a Override Alloy jacket between, or a resilience jacket between, depending on temps. In the coldest temps, I pair it under a Keis heated jacket, both under my Latitue. As a blood biker, I am riding through the winter - yesterday alone was a 3+ hour ride in 5 degree weather - this base laye, combined with the Keis heated gear and I could easily have done another 3 hours. Perfectly comfortable.

It hasn’t started to sag or lose shape after washing, and the colours are still vibrant. It’s one of those bits of kit that just quietly does its job and makes riding in colder weather far more comfortable. A really solid base layer and well worth adding to a Klim (or any other) setup.

Fits true to size and keeps you toastie in spring/autumn temps.
Too warm for summer but they do lighter weight options which I'll definitely be getting.

The aggressor 3 is the warmest Klim base layer, used mostly by the snowmobile crowd but a great UK winter base layer. Lighter material under arms, good length in the body and sleeve loops. Don't want to take it off

Excellent I have never been able to stay so warm and comfortable