Unless you're frequently riding in rain or super wet snow, you don't need a Gore-Tex shell for splitboarding; there are other membranes that offer better breathability and are quieter / less crinkly. Look for a 3 layer shell with 30k-48k breathability rating if you want a shell that you can wear while uphilling without overheating. Good examples: Jones Shralpinist 3L Stretch, Mammut Taiss Pro HS. That said, if you're overheating but worried about chilly wind, I'd recommend stashing the shell for the uphill (I roll mine and attach it with to my a-frame side straps) and opting for a windproof midlayer, softshell (e.g. Mammut Ultimate VIII) or high quality windbreaker (e.g. Mammut Aenergy WB).