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The Specialized Men's RBX Comp Thermal Bib Tights offer great comfort thanks mostly to the Body Geometry pad, but also the softness and warmth of the fleece fabric used for the main sections. I'd just like them to be a little more visible in the dark, though.
Apart from the bib section, these RBX Comp tights are made from a fleece-backed Lombardia fabric which feels great against the skin. It's soft and has plenty of stretch thanks to 16% of it being made up of elastane.
This means they move well with your legs and body as you pedal, without any feeling of restriction anywhere. Also, it means that the silicone grips at the ankles don't have to work very hard to keep everything in place.
The fabric works in a range of temperatures; I'd say I was comfortable in them from about 13°C down towards just below freezing, all depending on how hard I'm working.
On rides into a chilly northerly wind, I found them to block the chill effectively and you also get the bonus of some water resistance. This is enough to stop light rain or drizzle getting through for half an hour to an hour depending on how heavy it is. It's certainly better than nothing.
I found the fit great, with the mutli-panel design resulting in all sections sitting smoothly against the skin with no bunching, apart from the tiniest amount behind the knees when pedalling, which is always going to happen. There are no seams in this area, which helps with comfort.
The bottom of the legs, as I mentioned, just has a silicone gripper, no zips or anything, and that's the way I like it as there's no risk of rubbing or clashing with zips or fastenings on overshoes.
The bib section is made from a lighter weight fabric and again I found it to be very comfortable. The sizing is spot on, with plenty of length in the body, so I felt comfortable stretching out from the hoods to the drops.
The fabric is also breathable, so you won't overheat while sticking to your chosen way of layering up.
The chamois used is the Body Geometry 3D Contour, and while it looks quite simple, no multi-density sections of padding or channels criss-crossing everywhere, it works brilliantly.
The foam is firm enough to provide a cushion between you and the saddle, but not so much that it mutes all feedback coming through from the bike. It's a good balance, and one that I like.
There is a single channel running down through the middle to reduce any numbness and I felt no bunching up or hot spots at all, even on my three-hour gravel loop that I've tested these on countless times.
Overall, the quality is good with tidy stitching throughout. It's not the neatest I've seen on a pair of bib tights of this price, but no one is going to notice unless they are really studying them up close.
The good thing is that they are looking to be very durable, especially in key areas like where they come into contact with the saddle. I've seen other pairs get a bit bobbly after just a few rides.
One thing I would like to see is some more reflective detailing rather than the token small tabs on the back of each thigh. It wouldn't need too be massive, just noticeable, say on the rear of the calf to be picked up by following headlights.
Their rrp of £100 puts them in the same price bracket as the Orro Pyro Line Aquazero bib tights, which I think just have the edge on comfort, but they're well on a par with the £95 and great-fitting Altura Icon Thermal bib tights.
Overall, the RBX Comp Thermals offer a great fit and a very comfortable pad, plus their durability means they are well worth what could be seen as a fairly modest investment.
Well-made, durable bib tights with a great pad and comfortable materials
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road.cc test report
Make and model: Specialized Men's RBX Comp Thermal Bib Tights
Size tested: Medium
Tell us what the product is for
Specialized says, "Cold legs make for bad rides, and bad rides are no fun. Lucky for you, the RBX Comp Thermal Bib Tights keep your legs toasty on chilly days.
And to top off the comfort, we've used our Body Geometry 3D Contour Chamois with a variable density design that places support and padding where you need it, not where you don't."
Tell us some more about the technical aspects of the product?
* Made of soft and water-resistant Lombardia fleece, which stretches in two directions for comfort and easy care.
* Fabric Content: TIGHT84% Polyamide, 16% Elastane - UPPER 75% Polyamide, 25% Elastane
How easy is the product to care for? How did it respond to being washed?
I followed the washing instructions and had no issues. They came up clean after some very muddy rides.
Tell us how the product performed overall when used for its designed purpose
They keep the wind out and it's a bonus to get a bit of water resistance.
Tell us what you particularly liked about the product
Tell us what you particularly disliked about the product
Barely any reflectives.
How does the price compare to that of similar products in the market, including ones recently tested on road.cc?
They are pretty much the same price as the Orro and Altura bib tights mentioned in the review, and offer similar levels of performance and comfort.
Did you enjoy using the product? Yes
Would you consider buying the product? Yes
Would you recommend the product to a friend? Yes
Use this box to explain your overall score
I've scored the RBX Comps as 'very good' because they offer all the things I think are necessary for a pair of bib tights for use in the UK, being a material that keeps you warm without being restrictive, a comfortable pad for taming poor road surfaces, and impressive durability. Their lack of decent reflectives is my only real bugbear.
About the tester
I usually ride: This month's test bike My best bike is: B'Twin Ultra CF draped in the latest bling test components
I've been riding for: Over 20 years I ride: Every day I would class myself as: Expert
I regularly do the following types of riding: time trialling, commuting, club rides, sportives, fixed/singlespeed,
With 20 years of road cycling and over 150,000 miles in his legs it's safe to say Stu is happiest when on the bike whatever the weather. Since writing his first review for road.cc back in 2009 he has also had a career in engineering including 3D-CAD design and product development, so has a real passion for all of the latest technology coming through in the industry but is also a sucker for a classic steel frame, skinny tyres, rim brakes and a damn good paintjob.
His fascination with gravel bikes is getting out of control too!