• Main material:NylonVelcro
• The length can be adjusted from 22cm to 26cm(8.6"-10.2")
• This battery pouch is suitable for install the PVS-31 battery box on the helmet, and it compatible with most helmet by hook&loop system
• There is a velcro patch on the top design to place various signal lights
• The helmet battery pouch can be a bag to hold remote battery boxes for NVG's, also can be a counterweight pouch to balance your helmet