Balaclava with open back.
 
Main features:
- Adjustable magnetic buckle at the back of the neck makes it easy to put it on and off;
- Open back allows for good ventilation as well as various locations for ponytail/bun;
- Low profile elastic around face edge and seams on the outside ensure next to skin comfort in the sensitive areas, like neck and face; 
- Works well under all kinds of helmets: cycling/rock climbing/ski;

— WEIGHT (size M/L)- 36 g / 1.25 oz.

— FABRIC - grid fleece;

— CLOSURE - adjustable magnetic buckle (Fidlock);

— SIZE - XS, S, M, L, XL. Model is wearing size M. 
Note: head size doesn;t necessarily match your clothes size, but as a rule of thumb people that are 155 - 165 cm tall would wear S or XS, height 165 - 180 cm should pick size M, and people taller than 180 should go with size L. Also if your neck is on the larger side - size up. 
 
If you aren't sure - contact me at ks@functionalclothinglab.com and we will pick a right size for you.
 
MYOG
Want to make your own? Get patterns and instructions: https://www.functionalclothinglab.com/product-page/balaclava-pattern-1
 
NOTE: due to the open back construction back of the neck is exposed to cold. When temperature is below 10 degrees (Celsius) it becomes noticeable. Recommended solution: wear balaclava in combination with: hood / neck warmer / jacket with high collar / turtleneck baselayer etc.

Questions? Contact me at ks@functionalclothinglab.com;