Vivobarefoot Primus Trail III All Weather FG Review: Year-Round Trail Running
British weather doesn’t pause for your training plan. The Vivobarefoot Primus Trail III All Weather FG takes the proven Trail platform and adds water-resistant protection, so you can maintain your trail running through autumn and winter without soggy feet ruining the session.
Built for British Winters
Training through winter is what separates committed triathletes from fair-weather racers. But cold, wet feet can turn a beneficial trail run into a miserable slog. The All Weather FG addresses this with a water-resistant upper that keeps out light rain, puddle splashes, and damp undergrowth. It won’t survive full submersion, but for typical UK trail conditions — think muddy woodland paths, soggy canal towpaths, and drizzly fell runs — it keeps your feet noticeably drier than the standard Trail FG.
Key Features
- Water-resistant upper — Keeps feet drier in rain and wet undergrowth without sacrificing breathability entirely
- 3mm rubber base + 2.5mm lugs — Same proven grip pattern as the standard Trail FG
- 315g weight — Heavier than the standard FG due to weather protection, but still light for a waterproof trail shoe
- Zero drop, wide toe box — Full barefoot benefits maintained despite the added protection
When to Choose All Weather vs Standard
If you train year-round in the UK, the All Weather FG earns its place from October to March. The 34g weight penalty over the standard FG is barely noticeable, and the drier feet make a real difference to comfort and warmth on longer trail runs. For summer trail running, stick with the standard FG 3.5 — the better breathability matters more when temperatures rise.
Many triathletes keep both versions: the FG 3.5 for dry conditions and racing, the All Weather for winter base training. At £155, it’s a worthwhile investment in year-round training consistency.
The Verdict
The Primus Trail III All Weather FG is a smart purchase for any triathlete who trains off-road through the British winter. It maintains the barefoot ground feel and grip of the standard Trail while adding meaningful weather protection. Don’t let rain stop your trail sessions.
Price: £155 | Use code VIVO15MAR for 15% off full price items this March.
Shop Primus Trail III All Weather FG on Vivobarefoot
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