How to Measure for a Blanket: For best fit, stand horse squarely.
Measure from center of chest to edge of tail. Take care to
measure along the widest part of the shoulder and hindquarters.
The blanket measurement result is the blanket size. If an odd
number, round up to the next even number - 73" = 74".

Fitting the Blanket:  When initially trying the blanket for fit, please
use a sheet underneath to keep it clean in the event it needs to
be exchanged. In cold weather it's natural to want to close up the
neck; but please remember that horses spend the majority of
their time with their heads down. A blanket that is too high pulls
forward every time the horse lowers his head and can cause
rubbing at the shoulders and at the base and top of the wither.
Make sure the front is sufficiently low and roomy so the horse
can put his head down freely. Adjusta-Fit® (Schneiders) allows
you to raise the front when necessary.  
Blanket Sizing
Temperature Guide
Warm of Blanket
Short Coat / Clipped
Medium / Full Coat
Extra Heavyweight
Subzero - 15 F
----
Heavyweight
15 F - 30 F
Subzero - 15 F
Midweight
30 F - 50 F
15 F - 30 F
Sheet
50 F +
30 F +
Durability Guide
Type
Durability
Comments
1680D Ballistic Nylon or 1800D
Polyester
Exceptional
Recommended for horses that
are hard on blankets or turned
out with other horses who may
bite or pull at a blanket
1200D Polyester or Ripstop
Nylon
Superior
Recommend to withstand the
rigors of turnout
600D
Standard
Recommend for horses easy on
blankets.  Occasion or monitored
turnout. Picket line use.