The Z1 SL-14 IAS has the same great features of the Z1-SL-14, PLUS the option designed for the Z1 SL full face helmet is a special fit for the Skytronic GFX Skydiving Computer and the NeoXs Audible Altimeter.
The option allows skydivers to fully operate the instrument without removing it from the helmet, giving easy access to all the functions. With the Skytronic GFX it also allows to view the wide graphic display, useful feature during formation jumps, where jump mates will be able to clearly recognize the current altitude and visual alarms, even at distance.
The instrument is firmly held in place by the specially designed holder, and can be removed if necessary (to replace batteries, for example, or to connect the Skytronic GFX to a computer) without using any tool.
The Z1 SL IAS is fully compatible with all the spare parts of the Z1 SL (liners and visors), available in the same colors. Click here to Z1 SL14 Color Choices!
Here's the easiest way to measure for either a Z-1 or an Evo: Take a cloth tape or sturdy string and find the circumference of your head above the ears at the widest point.
SIZING INFORMATION FOR Z1 HELMETS:
XS-21 SMALL: 21 1/4 - 21 7/8 inches; MEDIUM: 22 - 22 1/2 inches; LARGE: 22 5/8 - 23 inches; X LARGE: 23 1/4 - 23 3/4 inches; XX LARGE: 23 7/8 - 24 1/8 inches;
*The chinstrap is adjustable to adapt the collar to the different shapes and sizes. Adjustment is needed just once (as shown on the drawing), after that securing the Z1 SL-14 is easy as pulling the chinstrap and closing the clip: no further adjustment needed!