This hand warmer is very simple to make. Basically it is a pouch for your hand, mouse and mouse pad. First measure your mouse pad size, and make the template 1” bigger all around.
I started with knitting a rectangular shape then folded over to sew the 2 sides of pouch. Knit 2” of rib for opening. I decorated one side with cable.
Knit Gauge: 16 st x 22 rows = 4” (10cm) on size 9 (5.5mm) knitting needles.