Troy Lee Designs Helmets

Impact Tech and How It Holds Up in the Wet

The foundation of every TLD trail helmet is a dual-density EPS/EPP foam liner - two types of foam doing two different jobs. The firmer EPS layer manages the big hits, the kind that happen when you get it wrong on a rooty drop. The softer EPP handles lower-speed knocks, which, if you're honest, are the ones you're more likely to collect on a slippery Welsh descent in November. Together they give you a liner that doesn't have to choose between protecting you at speed or on the slow tumbles.

Layered on top of that is MIPS (Multi-directional Impact Protection System), the low-friction slip plane that sits between your head and the foam. When you hit the ground at an angle - and most real crashes are oblique, not straight down - MIPS allows the helmet to rotate slightly relative to your skull, reducing the rotational forces that cause the nastiest brain injuries. It adds a few grams and a modest cost bump, but it's a trade-off worth making.

Ventilation is where TLD genuinely over-delivers for UK riding. The large ventilation ports channel air through the foam liner, not just over it, which makes a real difference on those long, slow, steep climbs through dense woodland where there's no breeze and the humidity is oppressive. Hot head equals poor decisions, and a lid that breathes properly keeps you sharper for longer. The Sweatglide EVA wicking system complements this by channelling sweat away from the brow rather than letting it pool and drip into your eyes mid-descent - a small detail that matters enormously on muggy summer days in the Surrey Hills or the Peak District's shadier valleys.

The X-Static antimicrobial liner does the longer-term work. X-Static uses silver fibres woven into the padding to inhibit odour-causing bacteria, which becomes relevant after about three wet winter rides when most helmet liners start to develop a character of their own. The moisture-wicking properties also mean the padding pulls sweat away from your skin rather than holding it, so the helmet doesn't feel like a damp sponge by the time you reach the top.

Understanding the Troy Lee Designs Fit and Range

TLD's half-shell trail helmet lineup follows a clear hierarchy, and knowing where each model sits stops you overspending or undershooting. The A1 is the entry point - a classic, comfortable lid with a proven fit and straightforward construction. It's not stripped back; it just doesn't carry the premium trimmings. If you want a reliable trail helmet without the flagship price, the A1 is a sensible starting point.

The A2 steps things up with larger ventilation ports and the dual-density foam liner, giving you noticeably better airflow and improved impact management over the A1. It's the one most trail riders end up gravitating towards once they've tried it on - the ventilation difference is immediately obvious when you compare the two side by side.

The A3 is TLD's flagship trail lid. It brings extended rear coverage (useful if you ride technical, committing lines), the full Sweatglide system, and the most refined 3D retention dial in the lineup. The dial lets you micro-adjust the fit around the back of your head independently of vertical adjustment, which is the difference between a helmet that sits on your head and one that feels like part of it. If fit precision matters to you - and after a three-hour enduro ride, it will - the A3 earns the price difference.

The Flowline sits slightly apart from the A-series as a more relaxed, trail-focused option with a slightly different aesthetic and construction approach, worth a look if you want something a touch less moto-influenced in its styling.

Fit across the range runs to a slightly oval profile - longer front-to-back than side-to-side. If you've got a rounder head, try before you buy where possible, or check the return policy carefully. The 3D retention dial on A2 and above does a lot of the heavy lifting for individual adjustment, but it works within the oval template rather than changing it. Sizing runs true; if you're on the boundary between two sizes, go up and use the dial to snug it down rather than forcing a smaller shell.

TLD also makes full-on downhill lids and youth helmets that sit outside this trail range - if that's what you're after, head to the Troy Lee Designs full face helmets page for the downhill-specific options, or the Troy Lee Designs kids helmets page for younger riders.

Getting the Setup Right for UK Conditions

Eyewear compatibility is the first practical question once you've picked a lid. The A2 and A3 visors are shaped to stow goggles comfortably - push them up when you're pedalling and they sit under the brim without bouncing or skewing sideways. On technical routes in the Lake District or the Scottish Highlands where you'll be switching between goggle-on and goggle-up repeatedly, that retention matters. For drier, faster riding where you're running glasses instead, the open port design works well with most cycling-specific frames, though very wide arms on some performance lenses can foul the lower edge of the port - worth checking with your specific eyewear before committing.

Cleaning these helmets properly extends their life considerably, and UK riding gives them a proper workout. For the shell - whether matte or gloss - warm water and a soft cloth is all you need. Avoid solvent-based cleaners or anything with ammonia; they degrade the shell finish and can compromise the foam beneath over time. Never submerge the helmet or blast it with a hose at close range.

The X-Static antimicrobial liners are fully removable on all A-series helmets. Pull them out after a particularly grim ride, hand wash them in mild soapy water, and leave them to air dry flat - don't wring them or tumble dry, as that distorts the padding and kills the silver fibre structure that does the antimicrobial work. Get into the habit of removing them after every wet ride and you'll add months to their useful life. Replace the liner before you replace the helmet if odour becomes an issue - TLD sells replacement liners separately, which is a cost-effective fix.

Once you've sorted the lid, it's worth thinking about the rest of your kit as a system. TLD jerseys and MTB baggy shorts are cut to work together and share the same sizing logic as the helmets, so building a matched setup is straightforward. If you're adding protection, TLD body armour pairs well with the A2 and A3 for enduro riding, and TLD gloves complete the hand-to-head protection picture without doubling your budget.