To be safe, you need to be secured to your board. A legal requirement in some areas.

Wide neoprene cuff with quick release.
Double stainless steel swivels.

Straight SUP leash with 9mm urethane leash. Best option for general use whether on the flat water or in the surf.

• SUP leash with straight 9mm urethane cord
• Double stainless steel swivels
• T-bar board swivel connector
• Fixed leash plug loop / Kevlar rope 
• Triple wrap rail saver
• Wide neoprene cuff with quick release and internal key pocket