Before Chums made the Mariner name a fishing-line cord, it was this: a stretchy neoprene strap built for days on the water. Chums started out keeping river guides' glasses on their faces, and the Mariner comes straight from that world.

It's a simple bit of kit. The stretchy neoprene slips onto the arms of any standard frame and holds them snug, so your sunnies hang round your neck instead of heading for the bottom of the lake. It shrugs off water and dries quickly, which is the whole point when you're paddling, fishing or just mucking about on a boat.

This is older Chums stock, still in its original swing tag, so you're getting a proper bit of their back catalogue for less than a coffee and a muffin.

• Stretchy neoprene
• Great for water sports
• For all standard frames
• Water resistant
• Quick drying
• Coloured straps are black on the reverse