Hygiene Kit Premium – uvex K-Series. An intact earmuff will feel like new again when you periodically replace the ear cushions. This is both sensible and economical. The replacement process is simple and hassle-free, meeting high standards of comfort and hygiene. Each set includes a pair of soft, snug replacement cushions made of memory foam. Item No. 2599.972 for models uvex K2, uvex K3, and uvex K2H, packaging unit 1 set.