What features matter most in a snorkel set?

Across the reviewers we read, the consistent priorities are: a silicone (not PVC) skirt that actually seals on your specific face shape, tempered-glass lenses, a dry-top snorkel with a working purge valve, and fins sized for your foot rather than a one-size pocket. Anti-fog coatings help but most users still need defogger drops or baby shampoo.