Haglofs Triton was replaced by Haglofs Gemini (now discontinued as well).
The Treble looks like a nice jacket and I looked at it myself when looking for a hooded microfleece. But I don't think it is a direct replacement for the old Triton or Gemini which were 100w fleeces. The Treble looks more like a 200w fleece. In the end I managed to get a Haglofs Gemini from an online store in Germany and am very happy with it. Just right under a windproof.
Exhibit A: it says here that the Haglofs Treble is an update of the old Bungy hooded top.
Exhibit B: the Gemini is only 304g for a large as opposed to the Treble which is 440g for a large.
There's also the Mountain Equipment Shroud jacket, which looks like a direct copy of the Triton and seems to be on offer in a few places at the moment.
Well, the Treble Hood in a medium weighs in at 390g on my digital balance. The body is a textured microfleece, the darker areas are PowerStretch, it's very definitely not 200-weight equivalent.
My faithful Triton weighs exactly 100g less, but has only a single mini-pocket on the upper arm and is mostly microfleece. I suppose if you want to split hairs, the Treble is a cross between a microfleece and a Powerstretch top.
And the ME Shroud, with chest pockets and hood weighs a claimed 380 grammes and, like the Treble Hood, incorporates areas of PowerStretch along with microfleece.
But anyway, I'd agree that for many users, microfleece and/or PowerStretch is an ideal weight for layering under a shell.
I'm sure there was once a hard shell called full metal jacket. I think it was from mountain hardwear (the one with the nuts symbol). Full metal jacket being the type of round used by snipers.
Whatg point is the fleece hoodies anyway? I mean in our climate when it is cool enough for one it also rains and you have the hard shell jacket hood up anyway. I personally think hoodies are best kept for hangin out around your local coop or spar.
I wasn't trying to be pedantic (ok maybe a little bit ) but the way manufacturers and fabric suppliers constantly update their stuff and in particular change names is confusing.
I suppose most people would just try a jacket on and see if they fancied it but I buy most of my stuff off the internet (because the choice is limited where I live in Belgium). I had seen good reviews of the Triton and the Gemini (including on here) but with all the information on the internet I simply could not work out if the Treble jacket was designed to do the same as the Triton/Gemini or not, so in the end I bought a Gemini from old stock.
For the record my Gemini is 304g in a large with two handwarmer pockets and is made of Polartec Microfleece (?) with Polartec Power Dry stretch panels.
According to the Haglofs site the Treble is 440g in a large with two handwarmer pockets, a napoleon pocket and is made of Polartec Microfleece 765 (which is 200g/m2) and Polartec Power Stretch. The Haglofs site says specifically that it is made from the warmest microfleece so I figured that was where the extra weigth had come from and that it would be warmer.
I even looked at the other microfleeces on their site to try and make sense of it e.g. the Haglofs Single (not hooded) is made of Polartec Microfleece 761 which is 138g/m2.
Yeah, it's all very confusing - I blame fleece micro-differentiation. It's not like the old days when you had 100, 200 and 300-weight fleece and that was your lot, unless you went for Ultrafleece.
I suspect the added weight on the Treble comes down to Powerstretch makes sense being denser and heavier - it has elastane in it - and the additional pockets. I think the face on the Powershield is much more abrasion resistant than the microfleece, which should mean you can use a pack with the Treble without trashing the fabric on the shoulders. The microfleece looks lovely, has a sort of corduroy texture, which may trap a little additional air under a shell, but should probably be on the inside of the jacket.
So... I guess ultimately the Treble Hood has a little added functionality as a trade for a bit of added weight. I guess it depends on whether you think you'll wear the jacket alone with a pack from time to time when the slightly increased wind resistance and greater toughness from the Powerstretch panels makes sense.
) but the way manufacturers and fabric suppliers constantly update their stuff and in particular change names is confusing. 
