Croakies Terra Spec Adjustable Eyewear Retainer Black 1 Pack

Easy to use and attach to your sunglasses. I personally did not find the length too short - it was easy to get over my head even with a ponytail. It was a little tight, but nothing I thought twice about. I tightened these about midway down the ear pieces so if I had moved them back, I would have had more space. I've used them for tennis and also in the ocean, tightening them up on the back so they they didn't slide off. In both situations (even getting sweaty or hit by a big wave) they stayed on my head. They feel off around my neck once in the ocean but definitely kept them from getting lost! They are lightweight and don't get in my way at all.

Fue un regalo y ha cumplido satisfactoriamente las necesidades, llegó en buen tiempo, en perfecto estado y los materiales son de buena calidad

I found what I was looking for! An adjustable retainer that fits the 1mm wide metal shaft of my glasses. The connector fits the shaft tight, no slipping. The connector loop is a tiny rubber band with a hard plastic slider that allows it to fit almost any width shaft. It's amazing how well the rubber grips the shaft. Also, the plastic adjuster slider on the back of the strap, moves very smoothly. This means that I don't have to struggle with my arthritic fingers to move it up and down. Now on my icebreaker trip to the arctic, I can tighten the strap when I am in a zodiac boat going ashore, and when I am ashore, I can lengthen the strap so I can lower my glasses to see my LCD screen of my camera. Perfect!

Slightly small, but has a good hold of the glasses.

No valen la pena, tardan mucho en llegar y su calidad ha bajado mucho, por el precio consigues algo muchísimo mejor y muchísimo más barato, el cordón es de agujeta, nada recomendables.