Croakies Original Retention Cord Black Medium/Large. Founded over 40 years ago on the slopes of Jackson Hole Mountain Resort. This tried and true premium neoprene design has earned a reputation for saving your shades in style no matter what the conditions throw at you. M/L: Fits temple sizes 11-17mm. Specifications for Croakies Original Retention Cord: Manufacturer: Croakies Size: Medium - Large Package Contents: Croakies Original Retention Cord Croakies CRXL3HT: Original Retention Cord Black Medium/Large