I have a DIY 3 layer insultex and its warm to 28f and would like to add 6oz of primaloft to it to get to below zero.

I'm not sure about what to make.

These are some options.

-make a underquilt out of 6 oz primaloft and 1.1 oz ripstop covered on both sides, and attach semi permanently to top layer of insultex.

-sew 6 oz primaloft to one piece 1.1 ripstop and sew to existing top layer of insultex

, chime in in you have any ideas.