Size Chart Guide

  • Below-Knee
  • Measuring Tips & Videos

STEP 1: Measure Circumferences

Measure the circumference along three areas of your limb. First begin measuring the circumference 6 inches above your knee cap. Second measure the circumference around the middle of your knee cap. And last, measure the circumference 2 inches (5cm) up from end of your residual limb. Continue to STEP 2: Length


How to measure for a bk stump shrinker.

STEP 2: Length

Length is a matter of preference, however the general rule is 2 inches past your knee cap. Continue to STEP 3: Find your size


STEP 3: Find your size

Take all of your circumference and length measurements and use the chart to determine your size. If you're in-between sizes, we suggest remeasuring again to be on safe side.

BK Size 1 16 1/4 12 1/4 11 1/2
BK Size 2 17 1/4 13 1/2 12 1/2
BK Size 3 18 1/2 14 1/2 13 3/4
BK Size 4 19 3/4 15 3/4 15
BK Size 5 20 3/4 17 16 1/4
BK Size 6 22 18 17 1/4
Short 12
Medium 15

When taking body measurements, you need to use the correct type of tape measure. You will want to use a soft cloth or flexible plastic  tape measure, similar to what a seamstress uses. Do not use a metal measuring tape, used in construction (your measurements will be inaccurate).  Please don't guess, if you still have your sock packaging you can refer to the packaging size tab.  Pay special attention not to pull your measuring tape too tight.  Doing so will produce a measurement that is too small. 

The most difficult measurement is the bottom measurement.  Too often, people measure too high along the bottom of their limbs producing a larger "Bottom" measurement.  Ideally, measure 2 inches up from the bottom of your limb and use a pen to mark this level on your limb. Once you know exactly where to measure, use a tape measure to carefully measure your bottom circumference.



Prosthetic Categories

Medi USA

Medi BK Stump Shrinker with Clima Comfort and Clima Fresh, Silicone Top Band

Medi USA

Medi BK Stump Shrinker with Clima Comfort and Clima Fresh, Silicone Top Band

Size Chart Guide
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Ossur Medi BK Shrinker Description

Ossur Medi BK Stump Shrinker is a very thoughtfully constructed prosthetic shrinker intended to control edema and secondarily help with phantom pain. Ossur added Clima Comfort that employs two unique qualities. First, its special yarn fibers quickly move moisture away from the surface of our skin, avoiding the unpleasant feeling of dampness created by normal perspiration. And second, clima comfort allows extraordinary breathability, which ensures the best possible supply of oxygen to the skin, minimizing the possibility of dry, rough skin. Let’s not forget about Clima Fresh which prevents bacteria and micro-organisms from colonizing within the fabric, which minimizes or eliminates the potential for unpleasant odors. This technology is built into the shrinker during the manufacturing process and not a chemical treatment. The end result is a shrinker that maintains its unique qualities wash after wash.


  • Ossur Medi Shrinker is designed for below-knee amputees
  • Silicone beaded top band for exceptional suspension & prevents falling off when sleeping
  • Soft and smooth fabric offers easier application and improved finish
  • Medi Clima Comfort keeps your limb dry and allows extraordinary breathability
  • Medi Clima Fresh prevents bacterial colonization within the fabric
  • 20-30 mmHg gradual compression shrinker
  • Sold each
  • Made in USA

Have product questions? We're here to help!


Features & Details

Ossur Medi Shrinker Materials

70% Polyamide, 30% Elasthane

Directions for Use

Apply your Ossur BK shrinker by placing the bottom of the shrinker on the end of your limb. Slowly pull and work the material up onto your limb. Last, adjust final placement and smooth out any creases that formed during application. Do Not pull your shrinker onto your limb by grasping the top edge only. It is highly recommended that you review usage guidelines with your Prosthetist and report any changes in fit or condition of your residual limb. Changes in the size of your limb may occur, in which case a new limb measurement should be taken and a new shrinker fitted if necessary. Do not wear the shrinker while your prosthesis is in use.

Care Instructions

To keep your stump shrinker functioning properly, Ossur recommends hand wash daily with warm water or machine wash daily using the lowest permanent press setting. Use a mild compression detergent and do not launder with fabric softeners, chlorine, or other additives.


Discontinue use and consult with your Prosthetist if any issues or changes in your limb and/or skin develop. Shrinkers are contraindicated for open wounds or weeping areas on your limb, stasis dermatitis and non-reduced edema.


If you're not completely satisfied with your Amputee Store purchase, you can return your eligible items within 90 days of the original ship date. Items in new condition (unopened/unworn/unwashed) can be returned for a full product refund less original shipping costs. Please read our complete return policy for further instructions.


Ossur Medi Shrinker typically ships within 3 business days.

Product Packaging: Polybag

Customer Reviews & Questions