Purchased a Nomos Orion in June and have worn it quite a bit without issue. On two occasions in high heat doing a lot of walking (10-15 miles around the city) I developed a fairly bad rash/dermatitis under the band.

Sweat/heat seems to be a factor, however I’m wondering if cordovan (horse) allergy is a thing? I don’t recall having this reaction to other leather bands in the past.