SEASHIELD CPR Serum for Medium & Coarse HairLAlga. SEASHIELD CPR Serum for Medium & Coarse Hair An intensive moisturizing serum specially formulated for medium to coarse hair. The advanced formula delivers deep hydration while creating a protective barrier against heat damage caused by styling tools such as blow dryers, curling irons, and straighteners. Powered by hyaluronic acid, the serum helps attract and retain moisture within the hair fiber, while peptides support hair strength and