Field Notes

50FP doesn’t automatically mean warmer. Fill power tells you the quality of the down, while fill weight tells you how much of it is actually in the bag. The two numbers matter together, not in isolation.

Buy once, cry once” sounds like solid outdoor wisdom, and sometimes it is. But expensive gear doesn’t automatically mean better value. Here’s when the cost-per-use argument actually holds up, and when it’s just an excuse to spend more.

“Ethically sourced” doesn’t always tell you much on its own. RDS certification does, but only if you understand what it actually covers. Here’s what the Responsible Down Standard guarantees—and what it definitely doesn’t.

Hydration should be simple, but a bottle that doesn’t quite fit its pocket can turn a tiny design flaw into constant irritation. Here’s why we think hydration accessories should be designed around the pack, not bolted on afterwards.

R-value is one of the few genuinely standardised numbers in outdoor gear. Since the introduction of ASTM F3340, a proper industry test standard, brands that test to it are measuring the same thing the same way, which is more than can be said for a lot of outdoor spec sheets. That’s the good news. The number is real. It’s also only describing one part of a bigger picture, and treating it as the whole answer is where a lot of pad-buying decisions go wrong. What R-value actually measures R-value describes thermal resistance, how much the pad resists heat moving from your body through to the cold ground beneath you. Higher numbers mean more resistance to that heat loss, which in practice means a warmer night on cold ground. It doesn’t measure comfort, durability, or how a pad performs once it’s been rolled up and unpacked a hundred times. It measures one specific thing, well. Why two pads with the same number don’t sleep the same The number is standardised. The pad around it isn’t. A narrow mummy-shaped pad with an R-value of 6.6 and a wide rectangular pad with the same rating are protecting different amounts of your actual body from the ground. If you move at all in the night, and most people do, rolling even slightly off a narrow pad puts an uninsulated section of you straight onto cold ground, regardless of what the R-value claimed. Construction matters too. Reflective film layers, synthetic fill baffling and down-fill baffled pads can all reach a similar lab-tested R-value through different mechanisms, and they don’t all behave identically once they’re compressed under your weight, or if there’s any moisture involved. The number tells you the pad passed a specific lab test. It doesn’t tell you how it behaves at 2am when you’ve rolled onto your side. Inflation firmness plays a role as well. A pad that’s slightly underinflated loses some of its insulating loft and doesn’t perform to its tested R-value in practice, which is a real-world variable no spec sheet number accounts for. How to actually choose one Start with the coldest temperature you realistically expect to sleep in, and build in a margin rather than cutting it fine. Consider how you actually sleep: side sleepers and people who move around at night benefit more from width than the R-value number alone suggests, because staying on the insulated surface matters as much as how insulated it is. And treat R-value as a starting filter, not the final decision, once you’re comparing pads in a similar range. Where our pad sits in that picture Our pad is a wide, rectangular 190 x 60 x 10cm shape with an R-value of 6.6, built from 20D recycled ripstop nylon with Mylar-film insulation, at roughly 666g. That puts it among the higher R-values available at this format and size, heavier than the lightest options on the market like a 340g, R4.5 pad, but built around covering more of an active sleeper’s body with real insulation rather than chasing the lowest possible weight. That’s a deliberate trade, not an oversight, and these figures are still provisional pending further testing. The takeaway R-value is a real, standardised, useful number. It’s describing one variable in a system that also includes shape, construction and how you actually sleep. Worth knowing before you let a single figure make the decision for you. Over and Out

A lighter pack doesn't automatically feel lighter. How the load sits on your body, whether the hipbelt is actually doing its job, and how stable the pack stays on the move can matter far more once the miles start adding up.

Gorpcore has taken technical outdoor gear well beyond the hills, and that's not necessarily a bad thing. But when performance gear starts being designed for the café as much as the campsite, it's worth asking what the original brief actually was.

Tracking your base weight can be a genuinely useful way to understand your kit, but there’s a point where the number stops helping. Here’s why chasing the lowest possible weight can become less about better gear choices and more about winning a spreadsheet.