Alpha® Hybrid Liner - Locking

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The Alpha® Hybrid Liner combines several hallmark liner characteristics into one product. Transtibial amputees wearing the Alpha® Hybrid Liner experience a comfortable thermoplastic elastomer liner that allows for easy bending and flexing of the knee, controlled pistoning, and easy donning. The liner is well-suited for amputees accustomed to the durability of silicone but seeking greater comfort and skin-friendly composition.

The Alpha® Hybrid Liner with progressive gel style and accordion umbrella is a solution for several common amputee issues:

  • For extra cushioning during ambulation the liner's distal gel thickness is 9 mm.
  • Protection for the sensitive tibial crest area is provided with 6 mm gel thickness.
  • To reduce bunching and allow for a broad range of knee motion, gel thickness behind the knee was reduced to 2.5 mm.
  • For less bulk at the top of the liner, the 2.5 mm gel thickness was extended to the liner’s proximal edge.

The liner's hybrid gel provides a balance of comfort and durability. It protects the limb from impact, continually cushions the limb, and resists excessive elongation. The hybrid gel is perfectly paired with the Select Liner's one-way stretch fabric that effectively controls pistoning without incorporating a distal matrix. This unique fabric, engineered exclusively for WillowWood, allows circumferential stretch, yet maintains liner elongation within specified limits.

A flexible panel incorporates an abrasion-resistant fabric allowing the limb to easily flex without pulling and tightening at the knee. When coupled with the thin gel behind the knee, the liner allows for comfort while sitting or bending for extended periods of time. A new socket should be fabricated for best use of the Alpha® Hybrid Liner with progressive gel style.

The Alpha® Hybrid Liner with uniform gel style is a solution for amputees currently wearing a 6 mm uniform Alpha® Liner and want to experience the benefits of this new liner. The Select with a uniform gel style has a standard umbrella and should retrofit with current sockets.


Styles Progressive
Gel Hybrid
Colors LightGray/Gray
Thickness 9 mm distal, 6 mm tibial crest, 2.5 mm proximally (Progressive)
6mm (Uniform)
Sizes Small, Medium, Medium Plus,
Large, Large Plus, Extra Large
Trial Period 10 days from fit date/invoice date
Warranty 12 months from fit date or invoice date
Register online at
U.S. Code
L-5673 Locking Liner
(bill once per liner)