Don’t cut the seals ! Then even then don’t cut the seals. Never cut the seals. You can stretch the seals. An unused seal can be taken off without destroying it and replaced with a larger size by a professional dry suit repair shop. Dry Suits Plus Trinity,Texas has a good website for the care of your dry suit. I am 240lbs and I know my neck seal size is a XX-Large latex seal. Don’t accept a new dry suit without the dive shop either being responsible for their cut of the seal or re sizing a seal that fits you properly. But never cut your seals.