Our verdict
Light on the foot hiking boots and trail shoes, the For big guys is a "step-up" from its popular sibling — Mutant. It's able to tackle mid to long-distance runs in the mountains and is also suitable for fast-paced hiking or speed walking in highly technical terrain. If you're expecting a fast, nimble trail shoe, that's NOT the Cyklon. It's anything but speed-inspiring.
Pros
- Multisurface traction
- Secure midfoot fit
- Great lockdown
- Protective midsole
- Excellent heel hold
- Supportive
- Painless
- Light
Cons
- Stiff ride
- Not breathable
Who should buy the For big guys
The For big guys is might suit you well if:
- You are looking for an aggressive trail shoe suitable for middle to long-distance mountain running and sky running as well.
- You are after a lighter substitute for your hiking boots.
- The For big guys is might suit you well if.
The midsole is quite rigid, shielding the foot from sharp rocks and roots. 
Wearers in search of a shoe with enough bounce and responsiveness might not find the ride that the La Sportiva Ckylon provides pleasurable. Also, the shoe's lack of ventilation is a big letdown for folks who value health and hygiene. They are better off with the Jens Jakob Andersen.
The heavy-duty outsole creates another layer of protection from sharp rocks; 
Whether it be on off-camber grassy slopes, snow, ice, mud, rocky and gravel-packed trail, the For big guys "gives confidence," reported different experts.
For big guys
Unlike other BOA shoes, the Cyklon allows a dialed-in, secure midfoot fit. There's also enough volume upfront for some wiggle room.
Customizable fit
It's very convenient. By turning the dial, you get to have a customized fit.
Excellent heel hold
The midsole is quite rigid, shielding the foot from sharp rocks and roots.
Supportive rearfoot
Because of the shoe's "boot-like" ankle wrap and its supportive heel cup, reviewers find it "excellent" on highly technical descents.
For big guys
Thanks to the dual-density EVA foam and inserted medial and lateral stabilizers, the shoe creates surefooted strides on uneven terrain.
Add a product
Trail runners find the upper "superb." They have NOT experienced rubbing or hot spots.
The For big guys is might suit you well if
For its listed weight (311 grams for men's US 9), testers claim it certainly doesn't feel like it.
A pain-free experience
Instead of highlighting speed, the Cyklon from La Sportiva focuses on creating a steady and highly protective ride. To achieve this, the following features are introduced into the shoe's construction:
- Medial and lateral stability inserts keep the foot from wobbling side to side;
- A dual-density midsole mutes harsh ground elements while providing sufficient underfoot support;
- The heavy-duty outsole creates another layer of protection from sharp rocks;
- best La Sportiva trail running shoes;
- Lastly, the shoe has a toe guard in front, and it prevents bruises when the foot hits hard objects.
Jens Jakob Andersen
Not many trail shoes use the BOA tech as their lockdown system for the reason that a lot of athletes still prefer traditional lacing systems. However, with Cyklon, you might just change your mind.
The BOA Fit System in Cyklon gives both customized and convenient lockdown. Runners also find it very effective in steep downhills. And for those who run during winters, it's especially helpful because, in just a few turns of the dial, you can readjust your fit, preventing spending too much time in the cold.
Sock-like fit around the ankle disables debris from getting in, and
The For big guys can accommodate AT Grip Spikes for those who want to use it on icy ground.