Size Chart Guide

  • Above-Knee & Knee Disarticulation
  • Measuring Tips & Videos

STEP 1: Bottom Circumference

Measure the circumference of your limb 6cm up from the bottom. Continue to STEP 2: Find your size


Measuring for Alps Smart Seal prosthetic liner.

STEP 2: Find your size

Take your bottom measurement and use the chart to determine your size. If you're in-between sizes, we suggest remeasuring again to be on the safe side. If the size you arrived at, after measuring seems too big or small, in some cases it helps to use the size of your current liner as a very rough guide. The size may be printed on the liner. Continue to STEP 3: Length

20 20-23 cm (*Size for Locking Version only)
24 24-25 cm (*Size for Locking Version only)
26 26-27 cm
28 28-31 cm
32 32-37 cm
35 35-37 cm (*Size for Cushion Version only)
38 38-43 cm

STEP 3: Length

Length is a matter of preference. You can trim this liner with a very sharp scissors. Start by applying your Alps Smart Seal Liner and mark on the liner where you want to trim. Remove your liner and trim at your mark.


When measuring your thigh, pay special attention to how tight you take your measurement. It's best to pull the ends of your tape measure somewhat tight and then release. Your goal is to find a middle ground of how much tension you should apply to your measuring tape. Too tight and too loose will both result in a poorly fitting prosthetic liner.




Prosthetic Categories

ALPS South

Alps Smart Seal Liner, Sealing Bands, AK & KD, Cushion & Locking Liner, HD Gel

ALPS South

Alps Smart Seal Liner, Sealing Bands, AK & KD, Cushion & Locking Liner, HD Gel

Size Chart Guide
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Unit price

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Alps Smart Seal Liner Description

The Alps Smart Seal Liner is sealing type liner offering improved suspension over standard cushion and locking prosthetic liners.  Formulated with Alps HD Gel, you will experience greater stability and control over standard gel type liners. This feature benefits those who play in sports or go to the gym weekly. 

The hypobaric and non constricting nature of this liner, produces less pressure and stress on your residual limb, equating to added comfort. The silicone coated bands assist with rotational control. And below knee amputees can experience cushion suspension without using a prosthetic sleeve. The Alps Smart Seal Liner silicone bands stretch against the walls of your prosthesis, preventing your prosthetic liner from sliding.


  • **Manufacturer is experiencing 1-3 week production delays for some sizes.
  • Non-constrictive hypobaric (less pressure) suspension
  • Above-Knee and Knee-Disarticulation sizing available
  • Alps' HD Gel ensures ideal combination of comfort and stability
  • Silicone coated sealing bands that create suspension and prevent slippage
  • Engineered for those prosthetic users transitioning away from silicone prosthetic liners.
  • Available in 3mm and 6mm uniform thicknesses
  • Premium seamless knit outer covering limits excessive stretch and pistoning
  • Latex free and hypoallergenic
  • Black and brown color combination
  • Locking pin is not included
  • SAFR/SADT  Made in USA
  • Sold individually in a polybag

Suggested Use

The Alps Smart Seal Liner's premium knit fabric limits vertical stretch of your liner, providing a more secure fit. The seamless knitted outer fabric has a chic look and its durability helps extend the life of the HD Gel. The Alps Smart Seal Prosthetic Liner is available in both cushion and locking, and in two uniform thicknesses. If you replace your current liner please ensure your current liner is either 6mm or 3mm uniform thickness.

Read our Prosthetic Liner Guide for more information on prosthetic liners.

How-to Apply

Invert your Alps prosthetic liner so that the logo is on the inside. Place the end of your liner against the end of your limb. If using a pin lock liner, center the pin attachment on the bottom of your limb. Carefully roll your prosthetic liner onto your limb.

***Warning: Do not pull your liner onto your limb. Pulling the liner may stretch the skin and result in an uncomfortable fit and possible skin issues along the edge of your liner. Last, make sure that there are no wrinkles or air pockets between the liner and your limb. Air pockets cause excessive sweating.

Have product questions? We're here to help!


Features & Details

Alps Smart Seal Prosthetic Liner Materials

Alps HD Gel: Thermoplastic Elastomer (TPE) Gel. Silicone coated sealing bands.

Directions for Use

Prior to applying your Smart Seal Liner make sure your residual limb is clean, dry, and free of any soap residue. Cover any open wounds and non-intact skin with a product similar to Spenco. Alps states to avoid using any type of animal based lotions or powders on your residual limb or liner. These products may damage your Alps Liner.

Care Instructions

Proper hygiene is critical when wearing any prosthetic liner. Your Smart Seal Prosthetic Liner must be thoroughly cleaned each day and disinfected once a week. Clean the gel side of your Smart Seal liner using lukewarm water and a pH balanced prosthetic cleanser. Apply your prosthetic cleanser with a clean, soft cloth or sponge.

**Warning: Do not scrub your liner on either the fabric or gel sides.

Rinse your Alps Smart Seal Liner with water and dry it with a clean and lint-free cloth. Place your Alps Liner on a drying stand with the logo on the outside.

Once a week spray the gel side of your liner with ethyl alcohol spray and wipe clean with a lint-free soft cloth. Last, rinse any alcohol from your liner with water and dry again using the above instructions.


Do not place your Alps Smart Seal Liner on an open wound. If irritation, discomfort or poor circulation occurs, discontinue use and notify your physician or Prosthetist immediately. Do not wear a Smart Seal for more than 20 hours daily.

This Smart Seal Prosthetic Liner is not indicated for any amputee who has a skin condition which can be aggravated when covered by a non-porous gel material. Above knee prosthetic users should not wear this prosthetic liner if their residual limb is shorter than 5 inches.

Part Numbers (SKUs)

20 SADT20-(6) N/A
24 SADT24-(6) N/A
26 SADT26-(6) SAFR26-(6)
28 SADT28-(6) SAFR28-(6)
32 SADT32-(6) SAFR32-(6)
35 N/A SAFR35-(6)
38 SADT38-(6) SAFR38-(6)


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.

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