100 day trial available

Primus Swimrun Boot SG Mens


Wear your sustainability statement with the Primus Swimrun Hi. Using approximately 17 recycled plastic bottles to create a breathable mesh, paired with quick-drain zones to minimise water-weight. The over-ankle, neoprene collar keeps the foot firmly in place, whilst the extra-sticky Soft Ground sole features high-profile lugs for loose and muddy terrains.

1. Select Colour: Black/Orange
2. Select UK Size:
3. Optional Extras:

A selection of laces, insoles and apparel to pair with your Vivo's

This shoe fits true to size

Order before 14.30 Mon - Thurs for UK Next Day Delivery

Select size to show stock
100 day trial for barefoot beginners

We're confident that after 100 days of au natural foot freedom (you need to give them a proper outing) your feet will love being feet. So we're happy to give you a no-quibbles test run for 100 days.

All major credit cards accepted.


The Swimrun collection was developed in collaboration with ÖtillÖ, founders of the Swimrun World Championship. Seamlessly transition between wet and dry while keeping out grit and silt -- perfect for triathalons or any extra-sloppy trail runs.

  • Foot-Shaped Construction – for unrestricted foot freedom
  • Neoprene Ankle Sock – full ankle mobility in and out of water
  • Water Repellent Recycled PET Mesh – for minimal wet weight
  • Quick Drain Zones – pump water out with each foot stride
  • Sticky Soft Ground Sole with Tall Lugs – for traction in mud
  • Orange Rubber – for visibility in the water

Primus Swimrun Boot SG Mens DNA


Patented, ultra-thin, puncture resistant layer. 5x more puncture resistant than a standard sole of the same thickness.


Produced using animal free products and processes.

Removeable Insole
Performance Insole

3mm vegan insole. Take it out to feel the ground. Leave it in for a little extra warmth.

Breathable Mesh
Breathable Mesh

Synthetic multi-ply materials, to deliver optimum lightweight breathability and comfort.


Heat fused together for lightweight structure and stich-less durability.

Eco Rubber
Eco Rubber

A no-sew material, made from recycled tyres, with high abrasion resistance where you need it most.

Non Marking
Non Marking

Recycled PET
Recycled PET

Soft Ground Sole
Soft Ground Sole


Problem Fitting

Really sorry but had to return this item as I found it impossible to get them on my feet. They looked the part and I am disappointed that I can't manage to wear them, perhaps something to do with my lack of dexterity rather than the product, (Age 67)

My new best friends!

I’ve been dreaming about shoes like these for a while. I do ultrarunning and was looking for shoes that were light, minimalist, with a wide toe box, good grip, amphibious, wearable without socks, and that would keep all type of debris from hopping in for a ride.

The Primus Swimrun Boots meet all these criteria except the last two: The heal lug’s stiching rubs against my achiles tendon and forces me to wear socks, and the boot is not high or tight enough to keep pine needles and small rocks from jumping in. Another down side is that US half-sizes aren’t available. I would have taken a US 10.5 but had to settle for a US 11, which is a bit too long.

Small drawbacks aside, these are the best shoes that I own, and I have LOTS of shoes. I wear the Primus boots with very light socks and some gaiters, and that combination makes for the best running experience I’ve ever had with running shoes! I can really run free, through pine trails, mud, sand, puddles, rivers, rocks, etc. They’ve become my best running buddies!

Hey Vivo, if you’re listening, great work!

cool addition to the range.

Great all round sports shoe, looks good in the mud, in the sea and on the street!

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