Name: COS SLR TRI U-WH 3.5
Brand: Mavic
SKU: S00052370
Price: 3290 USD
Availability: InStock
Rating: 4.25 (4 reviews)

The Cosmic SLR Triathlon is a Mavic triathlon cycling shoe designed for athletes who want more than just a basic transition shoe. Positioned above the Cosmic Elite Tri, it features a more technical Matryx® upper combined with a carbon composite sole to improve foot support and energy transfer to the pedal. The Velcro® strap wraps around the instep, and its notch keeps it ready before putting the shoe on—a useful detail when the transition needs to stay smooth. Weighing in at 250 g, this model remains very lightweight for extended efforts. This road triathlon shoe is particularly suited for half and full-distance races, where stability, ventilation, and pedaling efficiency matter just as much as how quickly you can slip them on.

Main features

Matryx® support during prolonged efforts

The Matryx® upper is the part that wraps around the foot. Its woven construction provides more stable support than a traditional upper, with good breathability as intensity increases. On the Cosmic SLR Triathlon, it works with the strap to limit unwanted foot movement—a key factor in half and full-distance races where the pedaling motion is repeated for several hours.

Power transfer via carbon composite sole

The carbon composite sole provides a more dynamic base than entry-level soles, while maintaining useful tolerance over long distances. Combined with the support of the Matryx® upper, it helps transfer energy to the pedal. This is what clearly sets the Cosmic SLR Triathlon apart from the Cosmic Elite Tri: more support, more precision when pedaling.

Smooth transition with notched Velcro® strap

The Velcro® strap wraps around the instep and can be adjusted with a single motion. Its notch allows you to keep it open before putting the shoe on, so it’s ready to go as soon as you get out of the water. The heel loop completes this transition: you can grab the shoe more easily, even with a wet foot, and then adjust the fit once you’re on the bike.

Specifications

Weight (8,5UK) per shoe : 250 g

Cyclists' opinions

Overall ratingAverage

4.3

12345

4 reviews

5 stars 24 stars 13 stars 12 stars 01 star 0

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patrickAdvanced (+3 rides per week)

12345

7/3/26

“Chaussure confortable,légère efficace égale a elle même La languette est longue et frotte sur la manivelle cela est difficile à régler et deviens gênant”

Answer from the team

“Bonjour Patrick, Merci pour avoir pris le temps de partager votre expérience et donné votre avis sur le produit. Votre remarque sera remontée au chef produit afin de trouver les améliorations possibles. Sachez que la chaussure doit s'adapter au plus grand nombre de formes de pied et que nous essayons de répondre à cela. Si nous avons une solution à vous proposer nous vous contacterons. A très vite, L'Equipe Mavic”

ChadAdvanced (+3 rides per week)

12345

6/26/26

“Good shoe. Velcro strap is a bit long and the excess material easily hits the crank arm.”

Answer from the team

“Hello Chad, Thank you for your comment and feedback. We’ll also pass this information on to our product manager. Enjoy your rides, See you soon, The Mavic Team”

andréAdvanced (+3 rides per week)

12345

6/25/26

“Très bon maintien sur le pied et très bonne aération. J'ai ajouté un petit bout de scratch car je trouvais que la languette qui assure le serrage sur la cheville avait tendance à ne pas plaquer sur la chaussure à son extrémité.”

Answer from the team

“Bonjour André, Merci pour votre commentaire et votre retour d'expérience. Nous prenons en compte votre remarque qui sera remontée à notre chef produit. Nous vous souhaitons de belles sorties! A très vite, L'Equipe Mavic.”

LindaAdvanced (+3 rides per week)

12345

6/8/26

“Love these shoes, I've had 4 generations of the Cosmic and can't say enough about them. The fit, comfort and power transfer are unmatched. My triathlon go to shoe for the last 10 years.”

Answer from the team

“Hello Linda, We are so happy for you! We are doing everything we can to continue innovating and adapting to the needs of athletes. Good luck with your triathlon! The Mavic Team”

Tri shoes

COSMIC SLR TRIATHLON

$329.00