List Price US $75
4F Base Layer Top Base Layer Review
Type First Layer
Primary Waterproofing None
Outer Layer Waterproofing None
Insulation Type None
Taped Seams None
Waterproof Zippers No
Hood Type No hood
Powder Skirt No
Jacket to Pant Interface No
Venting None
Meshed Vents No
Layer Count 1 Layer
Waterproof Rating
Breathability Rating
Manufactured in Imported



Very Thin

4F Base Layer Top 2016 - 2015 Review by A Better Ski

The 4F Base Layer Top has quickly become my favorite base layer for any ski day. I hadn’t heard of 4F until this past fall, but they are a Polish company that has been around for over 10 years. This season was the first season I had seen 4F in the US, and when I got my hands on a sample I was very intrigued to test it out. I don’t totally recall the name of this particular model, nor am I sure that it’s still available. However, this base layer is my go to for every day on the mountain, and if you can find any other 4F layers that are similar, it may be worth looking into getting one.

4F Base Layer Top Video Review

Tester: Matt

Size: M

Matt’s Specs: Sizing Info      

Fit: The 4F Base Layer Top has a compression type fit that is definitely tighter than a standard layer. I love the tighter fit because it keeps the top from bunching up underneath all of my other layers. The fit is pretty true to size and the small fits me perfectly. The fabric has quite a bit of stretch to it, and even if it fits a bit smaller for other body types, you should have no problem finding one that will fit. I’m actually quite impressed with how much I can stretch the fabric without losing any of its original shape. I know this doesn’t seem like a big deal, but it makes me believe this layer will hold up for quite a long time. Now, I have only had this for one season, but so far it looks like it did when I first got it.

Features: The 4F Base Layer Top doesn’t look all that different from most base layers. It’s form fitting, stretchy, insulating, and wicks moisture away really well. Still, I’ve grown to love this layer more than any others in my collection. The biggest reason has to be how comfortable the feel of the 4F is. The fabric itself is quite soft, but when combined with the comfortable fit, it almost feels like I’m wearing nothing at all. Sometimes tighter fitting layers can feel restricting and can get quite uncomfortable after a long day of skiing. With the 4F Base Layer Top I never feel restricted, and never feel like I can’t wait to get it off. It feels great on my bare skin, and even after a long day of hard skiing (and sweating) I still feel comfortable. While I don’t know a lot about the fabric (It’s Acrylic, Polypropolene, Elastane, and Viscose), nor about the environmental friendliness of it (it smells a bit plasticy at first) I can say that it works really well for skiing. Not only is it the most comfortable layer I own, it also does a great job of keeping me warm and dry. It wicks moisture really well, and when I need it to insulate it does. At the same time, the wicking properties can also have a cooling effect on days when I’m working hard and need to stay col and dry.

Bottom Line: I don’t know a lot about the 4F Base Layer Top, but I do know that it has become a favorite of mine over the season. It is one of the most comfortable layers I have used, while still retaining the wicking and insulating properties I want in a base layer. I’m not sure if it has any anti-microbial properties like the Bambool BT1, but I do notice a bit of funk after a hard day of skiing. It’s definitely not a big issue if you can wash it regularly, but if this is the only layer you brought on a long road trip your group may not want to stand really close to you by the end of it.

4F Base Layer Top Images

We try to get as many images of the 4F Base Layer Top, but forgive us if they're not all there.


4F Company Information

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