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BTwin 500 Sleeveless Cycling Baselayer



Bargain summer baselayer offers good comfort and breathability, but fit is less refined than more expensive alternatives

A sleeveless baselayer is designed to offer maximum comfort on hot days, giving a very breathable layer against the skin to help dissipate sweat as fast as possible. You can spend as much as £50 on a sleeveless mesh baselayer, but for those who baulk at paying that much for something designed not to be seen, the BTwin 500 Warm Weather Mesh Baselayer is a much more affordable choice and it performs very well.

Decathlon's website recommends this as being suitable for a temperate range of 0 to 5 degrees. Happily, we didn't have those sort of temperatures while I've been testing it, and I'd be fairly confident that was a mistake. I've used this in temperatures between about 8 and 30 degrees, and I found it does a solid job of keeping me dry and comfortable.

> Find your nearest Decathlon store here

> Buy this online here

The fabric used is an open-weave mesh which is highly breathable and comfortable against the skin. Comparing it side-by-side with a similar baselayer from Craft, it is a bit less breathable and less stretchy, but not by a massive amount.

The most obvious difference is in the fit – as the material is a bit less elastic, and the cut is a bit simpler, I found it doesn't sit as smoothly against my torso, tending to hang a little loose beneath the arms. Ideally, a baselayer wants to be skin-tight, although it's only fair to point out that this is probably a size bigger than I'd ideally choose.

BTwin 500 Sleeveless Cycling Baselayer - chest detail.jpg

Another difference is the use of non flatlocked seams. Against the skin it's good to have as few sources of irritation as possible, and that's why more expensive baselayers tend to have flat seams. Thing is, I wore this for a number of rides both long and short and I can't honestly say I was ever bothered by the seams.

> Read our guide to the best baselayers

In short, it's not a match for £40 or £50 baselayers, but it does a really excellent job for a rock-bottom price. I think this is where my money would go.




Make and model: BTwin 500 Sleeveless Cycling Baselayer

Size tested: Large



Rate the product for quality of construction:

Fairly simple cut and construction, as you might expect at this price, but the fabric is comfortable and does a reasonable job of removing sweat.

Rate the product for performance:

Better than I expected. It isn't on a par with baselayers from the likes of Craft or Castelli, but it's thoroughly respectable at this price point.

Rate the product for durability:

No obvious weak points. Stitching not as neat as some I've seen, so this could be a weak point, but it didn't cause problems while testing.

Rate the product for fit:

This is arguably the area where you can most clearly see the difference between this and a baselayer costing £30. The cut is less complex and the fabric less stretchy, so it hangs a bit loose under my arms.

Rate the product for sizing:

I've got a large and that is probably sized for bigger chests than mine.

Rate the product for weight:

Weighs very little.

Rate the product for comfort:

Pretty good really for the money. There aren't flatlock seams but this simply didn't bother me, even on longer rides.

Rate the product for value:

Cracking value from Decathlon here.


Couldn't find any washing instructions but it seems to cope fine with a 40-degree cycle.


It's 80% as good as a £30 baselayer I'd say, which ain't bad at all.

Tell us what you particularly liked about the product

Breathable, comfortable and cheap as chips.

Tell us what you particularly disliked about the product

Not a lot. The fit is a little less refined than more pricey baselayers.

Did you enjoy using the product? Yes

Would you consider buying the product? Definitely

Would you recommend the product to a friend? Yes

Use this box to explain your score

For the money, this is a cracker. At this end of the market, value is a key consideration, and this offers banging value paired with decent performance. What's not to like?

Overall rating: 8/10

About the tester

Age: 37  Height: 188cm  Weight: 78kg





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