In reply to Dorq:
I've got both jkts,albeit last year's Infinity. I barely use the Neutrino just kept it for car camping or out and about to shops etc very warm lightweight and its a slightly longer cut, infinity jkt I've used on hills summit camps and car camping great jkt very warm for its weight however its very easily damaged so care is needed. I wouldn't say it was as warm as the neutrino but its barely noticeable as I run pretty hot
If I was only buying one I'd go for the Neutrino if your likely to use it for cutting about town if purely climbing Infinity End, again maybe come down to best price you can get
Either jkt won't let you down