What is Shell fabric and thread count?
The outer cover — cotton, poly-cotton, or downproof cambric.
Short answer
Polyester shells trap moisture and feel clammy in humid weather.
Shell fabric and thread count when buying a blanket & comforter
The outer cover — cotton, poly-cotton, or downproof cambric.
Why it matters: Breathable cotton shells prevent night sweats; downproof weave stops feathers poking out.
Look for: Polyester shells trap moisture and feel clammy in humid weather.
Full Blanket & Comforter buying guide