We're working out what we think - we'll add our view here!
A new concept in active insulation, the OMM Core Range is made entirely from PRIMALOFT NEXT ultra-light insulating fabric. Built from a synthetic plume woven through a knitted mesh, Core offers the warmth of a fleece but less-than half the weight. Paired with a shell, the Core is an incredibly effective insulator; but, thanks to near-total air permeability, the lightest breeze can take away that heat. This allows you to keep your Core layer on even when you have warmed up and you can thermoregulate by removing/unzipping your low bulk shell (eg. Sonic windproof at 49g). A true valley to summit piece. Core works wet or dry with incredible wicking properties to ensure you won’t stay wet for long.
PRIMALOFT® NEXT Insulating Fabric weaves PrimaLoft fibres onto a mesh giving a super high volume and open structure. Fabrics insulate by trapping pockets of air that the wearer’s heat cannot pass through. Core structure is exceptional at creating these pockets. However, the openness also allows for a light breeze to disturb these air pockets and remove the insulation effect. Core uses this to its advantage; put a light shell on over the top for the best possible warmth to weight layer and then when you get too hot, adjust/remove only the shell and you can keep pushing hard to the summit without a bulky layer to stash.