UL Karo Step Underquilt

This is an absolute beauty of an underquilt. Interesting design elements include Karo step with complex differential cut and z-line/shock cord combo for suspension. All that sandwiched in between a 1.0 HyperD lime green outer and a Membrane10 black inner. Gorgeous. 


Materials 

Outer shell - 1.0 oz HyperD lime green
Inner shell - Membrane 10 black
Insulation - 950 FP water-resistant down
Baffle material - Noseeum mesh (0.75-1.0" thick)
Thread - MARA 70 blaze orange
Other - 1/8" shockcord and 1.25 mm Z-line

Specs 

Weight: 13.2 oz finished weight, without stuff sack
Dimensions: 60" x 45"

How do I make it? 

Check out the video below for an explanation of the design:

 

UL Karo Step Underquilt
UL Karo Step Underquilt
UL Karo Step Underquilt
UL Karo Step Underquilt
UL Karo Step Underquilt
UL Karo Step Underquilt