The BTwin Aerofit shoe covers are designed to offer protection against both wind and water without the bulk and associated insulation properties of full winter overshoes. This combination makes them ideal for racing, or for wet but warm summer rides.
The uppers are constructed from thin, 0.3mm neoprene – itself a wind and waterproof material – with the seams heat welded on the inside. The material is stretchy enough that I was actually able to size down (using size 42 overshoes for my size 46 Bont shoes) in order to achieve a tighter fit at the calf and fewer wrinkles in the material. This should help both from an aerodynamics and a weatherproofing viewpoint, as loose fitting overshoes simply allows water to run down your legs and into your shoes.
You have to care, though, as stretching the already thin neoprene makes it particularly vulnerable to ripping on any protrusions, such as ratchets, on your shoes. Given how overbuilt the rest of the overshoes are, the neoprene is definitely where failure will occur first.
The toe and sole sections are reinforced using a tough, rubbery fabric to aid durability. The seams joining the neoprene upper to these reinforcements aren't sealed, but unless the soles of your shoes have air vents located right under these seams, water ingress shouldn't be a problem here.
The overshoes are closed using a non-waterproof, size 5 YKK zip which runs up the rear and includes reflective detailing on the tape. The spring-loaded zipper itself is nice and big making it easy to handle with gloves, as well as making it tough enough to withstand plenty of abuse.
In use, the waterproofing is about as good as you can expect from such thin overshoes. Road spray doesn't present a problem, but persistent rain will eventually find its way in, probably through the zips or the cleat holes. This makes these overshoes suitable for racing or for milder rides where insulation isn't required. From a purely aesthetic point of view, it would have been nice if the overshoes were a little taller, but that is just my own personal preference.
The snug fit means that the Aerofits work well when used for purely aero purposes, but the neoprene material means that things get clammy rather quickly inside. For anything other than a short time trial (10 miles and under), I'd say most people would find them too warm in anything above 18°C.
Performance wise, the Aerofit overshoes tick most of the boxes, but the quality of construction could definitely be improved. In particular, the seam on the reinforced toe section on one of the booties was a bit skewed, which meant that it pointed out like a sort elf shoe – not the greatest look. Uneven seams in this area will also likely negatively impact the aerodynamics of the overshoe, if one is to be really picky.
At just under £25 for the pair [currently £16.99 - ed], the Aerofits look to be decent value, if not the bargains one usually associates with Decathlon products. For instance, if you shop around, you can find aero overshoes from 'bigger' brands for less. On a more positive note, despite the sometimes questionable build quality, the Aerofits are pretty tough and should last if you take care when putting them on or taking them off.
Tight fitting, low bulk overshoes that provide enough weather protection to be useful on wet days
road.cc test report
Make and model: BTwin Aerofit shoe covers
Size tested: 42/44
Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?
BTwin describe the Aerofits as being designed for "mid-seasonal wet and/or windy weather" which tallies well with our impression. In addition, the snug fit means they are also suitable for use as aero overshoes if the weather isn't too warm
Tell us some more about the technical aspects of the product?
-Constructed from 0.3mm neoprene with reinforced toe and sole sections
-Heat welded seams on the uppers
-Size 5 YKK zip use as fastener
The heat-welded seams are good quality, but the sewing on the toe sections could be improved.
Offer decent weatherproofing given the low bulk. The stretch in the neoprene means one can size down to achieve a tighter fit around the ankle for improved aerodynamics and waterproofing.
The reinforced sections are heavy duty and not likely to wear out given the typical distances walked in road shoes. The neoprene itself is the weakest link in the chain, so care needs to be taken when putting them on or taking them off.
Light enough to be used in wet races without feeling like you've got 2 bricks on your feet.
Snug around my thin calves after having sized down. If you've got particularly large calves, going true to size would be advisable as the lack of velcro closure means that the zip could start to undue itself in use.
On the budget end of the aero overshoe spectrum, but not an out and out steal. Issues with the construction quality prevent a higher rating.
Tell us how the product performed overall when used for its designed purpose
The Aerofits are ideal as a race overshoe or for wet but warm training rides. Overall, they satisfy their brief.
Tell us what you particularly liked about the product
Snug fit around the ankle.
Tell us what you particularly disliked about the product
Slightly wonky seams on the toe section.
Did you enjoy using the product? Yes.
Would you consider buying the product? Yes.
Would you recommend the product to a friend? Yes.
About the tester
I usually ride: Canondale EVO Red My best bike is:
I've been riding for: Under 5 years I ride: Every day I would class myself as: Semi pro
I regularly do the following types of riding: road racing, time trialling, cyclo cross, commuting, mtb,