I've had a Helly Hansen Mars since 2006 and it (in Large) is just below the 70g mark too. I don't put much faith in such claims and they aren't really relevant to me anyway. I'd lose more weight than that in sweat going uphill for 10 minutes anyway!
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Can see why GL Is pricy to make, but there are hugely diminishing returns here Microlite @~52g/m2. Quantum @29g/m2 (lightest). GL @ 25g/m2.
In fact is 4 g/m2 actually measurable within the error margins of a real garment such as cut, features, 'sunk' weight such as zips etc? I'm not at all sure. If it is its a tiny difference.
Neither seem to be ultralightoutdoors gear (who weigh stuff themselves): GL. Especially this bit: " We weighed the GL and re-weighed the Standard Slipstream Jacket and they both weighed 68-70g - essentially the same."
Ooops Thats maybe down to the cut varying or something else but does perhaps make the point. Montanes website has 65 for a medium GL and 80 for a large slipstream so suspect they made that slightly heavier this year.
You do have to applued technical perfectionism even when not entirely obvious, but in something as 'short' lived as a lightweight windshirt with a price premium this size?
So I own a medium Slipstream gilet, and is tight and I emailed and confirmed with Montane this sizing feature is on the jackets also, so one small weight cheat-ette is the Slipstream is very narrow across the torso not a baggy as say the Litespeed so there is less acreage to begin with. Are these "lightest" like-for-like for real users, e.g. do you need to go large with the Slipstream GL when others you can fit in a medium....? The weight is obviously not the important aspect here, its packed size and in summer months if you're just using a minimalist camelbak type then these small jackets help avoid it dangling on the outside and risk of loss. Pricey for the GL'ness... is it really going to be worth it relative to the Slipstream?
I was out for a quick up/down hill walk yesterday evening and temperatures not that low but it was very windy and I was reminded that windproofs don't actually work that well in windy conditions, they flap and pump a lof the air they wish to trap, there does need to be room for some resistive insulation under the windproof for windy conditions, the medium Slipstream I own doesn't have the room.
The Slipstream gilet I own is long, like the Litespeed (both medium), which is good.
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