Sizing Chart for Flex Boots

 To make sure you get the correct size boots - please measure hooves right before and after a trim.  

Flex Hoof Boot Sizing Chart

Width  Inches Length Inches
Boot Size (mm) Width Min Max Min Length Max Length
90 3.5 3.3 3.7 3.5 3.9
100 3.9 3.7 4.1 3.9 4.3
110 4.3 4.1 4.5 4.3 4.7
120 4.7 4.5 4.9 4.7 5.1
130 5.1 4.9 5.3 5.1 5.5
140 5.5 5.3 5.7 5.5 5.9



 Theses size charts are intended as a guide, as many factors influence the fit of the boots.

Before being able to determine what is the best size of Flex Boots for your horse, please take a moment and read these instructions.

Be sure to take the measurements of the hoof not more than 1 or 2 days after a fresh trim.


Draw an imaginary line from heel to heel. Make sure that the heel is trimmed properly and that the weight-bearing area is in the right position.

  • From that line pull another line straight to the toe.
  • Now you can measure the length of the hoof.

DO NOT MEASURE BUTTRESS, only the weight-bearing area of the hoof wall.


Draw another line from the widest part of the hoof across the sole to the other side.
This is the width of the hoof.

  • If you have fresh trim, and the hoof is for example 115 width and 120 lengths, we recommend size 120 with FlexPad for the growth of the hoof.
    If you have a trim for example 3 weeks old, and the measure is the same, then we recommend size 110 and do the trim frequent enough to be able to use a smaller size. Hooves should be trimmed with maintenance trim weekly to be able to remain the shape of the hoof in balance and to get the most out of the boots.
    It is not recommended to have extra growth at the hoof and a too-large boot. A horse will not feel comfortable anymore. 
  • You can use Flex Hoof Boots for hooves of many different sizes and shapes. If however, the width of the hoof exceeds 10 mm in length, this boot is not perfect for your horse.
  • If the hoof is very narrow and the horse has a habit of twisting her/his legs strongly, it may be that our flexible boot is not suitable for your use.
  • We have learned over years of using and selling many brands of boots, that any boot can fall off during a fast speed gallop if the horse steps on his front heels with his hind legs. FlexHorse boots, when properly fitted, are very sleek so usually, they do not fall off in a situation like this. However, as we are talking about the heavy and powerful animal, we just cannot be sure. If your horse has this problem with FlexHorse boots, or your horse is nervous in trails and jumps around and steps on his feet, please consider using bell boots on FlexHorse boots. It is perfectly normal to cover the legs from a hit of the iron shoe, why not cover the boots from the hit of the leg?
  • If you are not sure about the size after measuring the hoof, please contact your dealer or send us email for help. We need pictures of the hooves before and after a fresh trim. Please keep in mind, that Flex boots require a trim made by anatomy of the particular horse and are kept in a good shape by the owner. 


Speaking of trim - here is an easy guide to show the proper trim for Flex Boots: