Kalf Flux lightweight jacket review
Kalf’s jacket is comfortable and made from a breathable technical fabric

The Kalf Flux lightweight jacket provides a good level of rain protection in a lightweight shell. But it’s not as long as some other waterproof jackets, is black only and has fewer reflective elements.
-
+
Close fit means no windflap
-
-
Black only
-
-
Few reflectives
-
-
Not super-packable
-
-
Quite expensive

The Kalf Flux lightweight jacket is made of a lightweight, ripstop, breathable waterproof fabric. It’s comfortable and a close fit, so that there’s little windflap, although the technical fabric is quite rustly when you move around. You get a high, close-fitting, lined collar which is effective at preventing the rain getting in.
To help keep the rain out, all the seams are taped, as untapped seams will eventually let in the rain. The front zip is water resistant and backed, so helping to keep rain out from the front – a nice feature as the zip takes the full force of any downpour as you pedal. but although the tail is dropped, I found the Kalf Flux lightweight jacket was quite short in the body, so wheel spray is an issue.
>>> Cycling in the rain: how to survive it
Sleeve length is good, so the arms don’t feel tight when riding. There are close-fitting cuffs with a narrow elastic band that keeps water out effectively.
The front of the Kalf Flux lightweight jacket includes a small pocket with a waterproof zip. You could use it to keep your keys safe or for a few gels, but there’s not enough capacity to replace your rear jersey pockets.
Rain usually means low light conditions and poorer visibility for car drivers. So I prefer a lighter colour and reflective details. In both these regards, the Kalf Flux lightweight jacket is deficient.
It comes in black only and although there’s quite a large rear reflective 'K' logo, the front just gets a tiny reflective element. The Endura FS260-Pro Adrenaline race cape has many more hi-viz details and costs £32 less than the Kalf Flux lightweight jacket.
Packed, the Kalf Flux lightweight jacket will fill a pocket. If you roll it into a longer sausage shape, it won’t bulge so much but protrudes from the pocket top.
At £110, the Kalf Flux lightweight jacket isn’t cheap, although it’s in line with many other proper waterproof numbers.
Thank you for reading 5 articles this month* Join now for unlimited access
Enjoy your first month for just £1 / $1 / €1
*Read 5 free articles per month without a subscription
Join now for unlimited access
Try first month for just £1 / $1 / €1
Paul started writing for Cycling Weekly in 2015, covering cycling tech, new bikes and product testing. Since then, he’s reviewed hundreds of bikes and thousands of other pieces of cycling equipment for the magazine and the Cycling Weekly website.
He’s been cycling for a lot longer than that though and his travels by bike have taken him all around Europe and to California. He’s been riding gravel since before gravel bikes existed too, riding a cyclocross bike through the Chilterns and along the South Downs.
-
'It’s all about quality for Zwift. You don't need to be a full-time rider': Joe Rees on preparing for the eSports World Champs
Trainee teacher Joe Rees on squeezing in training for the UCI eSports World Champs alongside hectic study commitments
By David Bradford • Published
-
Lamperti, Ryan handily defend US National Criterium titles
Bike racers Kendall Ryan and Luke Lamperti defend their US Criterium Championships titles in Knoxville, Tennessee.
By Clara Beard • Published
-
Women pro cyclists take a knee during national anthem at US Pro Nationals to protest abortion ruling
Start line of the US National Criterium Championships turned into a silent protest after Roe v. Wade was overturned
By Anne-Marije Rook • Published