Which item is used to attach a surfer to a board?

The item used to attach a surfer to a board is the leash, commonly referred to as "correa" in Spanish. A leash is a crucial piece of equipment in surfing that connects the surfer to their board, ensuring that the board remains close by after the surfer falls or takes a tumble in the water. This not only enhances safety by preventing the board from drifting away, potentially posing a risk to others, but also allows the surfer to easily retrieve the board and get back on it after a wipeout.

The other options mentioned do not serve this purpose: a "funda impermeable" translates to waterproof cover, which protects equipment from water damage; "casco" means helmet, providing head protection during surfing; and "remo" refers to a paddle, which is used primarily in paddleboarding or kayaking, not surfing. Understanding the function of each item helps clarify the vital role of the leash in surfing.