I’ve only tried the Sonetics muffs and the 3M ones. I did a quick inter webs search on MSA muffs and not sure what I am looking for. Where did you get yours Swing? Also, to derail the thread just a bit, opinions on comms? Sena? Sonetics? Something else?
I can definitely see how they're much more comfortable than the Petzls, especially with visor and muffs (never worn a petzl with attachments, I use a stihl helmet for that). When working in the climbing park I work at I use either a vertex vent or alveo vent. I think the vertex has better ventilation, but I still sweat like a pig. I think a Kask would be much worse.