Merrell Agility Synthesis Flex Trail Running Shoes - Men's 5059-321

Merrell Agility Synthesis Flex Trail Running Shoes - Men's

Size Guide

Rocksolid Guarantee

Shop with confidence. If it's not working out like you expected, you can return it.

Really. If it's not up to snuff after you use it (a couple times) you can still bring it back.

It lasts longer than 30 days, but not forever. We'll be fair about it. We're all members here.

Price match guarantee

Found a better deal in Canada? Up to 30 days after purchase – we’ll match it.

If you see a lower price for this exact item advertised online, in print or in a store, give us a call at 1 (888) 847-0770.

If it’s identical, brand-new, in stock, and sold and shipped by a Canadian-based retailer, we’ll match that price.

See available Trail running shoes


Show Description

A quiver of one for runners who split their time between asphalt and forest floor. Lightweight mesh uppers let feet breathe as you pick up the pace, while a toecap protects against rogue rocks. Grippy lugs work equally well on slippery pavement and muddy trails, and an internal antimicrobial treatment keeps odour to a minimum after a day of vaulting over gnarled tree roots.

  • Lightweight synthetic mesh upper with polyurethane overlays for added support.
  • Protective toecap.
  • Antimicrobial treatment reduces shoe odour.
  • Articulated EVA midsole is flexible and supportive.
  • Protective midsole pad adds underfoot protection for rugged trails.
  • Grippy rubber outsole with moderate 5mm lugs is suitable for both road and trail running.

Tech specs

Show Tech specs
Ideal for Trail running

'Minimal and natural' shoes offer low drop, lots of flex, and minimal cushioning. Most running shoes are 'Light and responsive' with medium cushioning and good energy return. 'Cushioned and floaty' shoes have maximum cushioning.

Light and responsive

Some shoes include added motion control or stability features to help minimize over pronation, where the foot tends to roll inward in a biomechanically imbalanced running position.

Upper material Synthetic
Closure Lace-up
Heel-to-toe cushioning

The approximate thickness of the midsole cushioning under the heel and the forefoot. A thicker heel and greater difference between heel and toe height tends to suit heel-strike runners, while forefoot and midfoot strikers may prefer a minimal drop between heel and toe cushioning.


The drop is the difference in height between the heel and the forefoot midsole cushioning. Traditional running shoes tend to have a 10mm drop or higher while minimalist style shoes are on the lower end of the spectrum.


Waterproof shoes and boots feature a waterproof-breathable membrane and a gusseted tongue to help keep your feet dry in wet conditions.

Removable insole Yes
Made in Vietnam