Binoculars are much more comfortable to carry using the ZEISS Air Cell Comfort carrying strap. Cushions of air sealed within the material spread the weight of the binoculars across the entire neck area, which makes them noticeably much more comfortable to carry. On long observation days and extended hikes the Air Cell Comfort carrying strap offers welcome relief for your neck and shoulders. The carrying strap is suitable for binoculars with a lens diameter of 30 mm or more.