12-Month Product Warranty on all PRO Sleeves

  • Pair of Mammal Strength Stiff Knee Sleeves PRO made from ultra-stiff black CR neoprene for maximum knee support during heavy lifting
  • Front view of Mammal Strength Stiff Knee Sleeves PRO showing ultra-stiff 7mm CR neoprene construction and PRO spec branding
  • Mammal Strength Stiff Knee Sleeves PRO showing ultra-stiff knee sleeve design and made-for powerlifters, weightlifters, and strongman competition use
  • Height measurements of Mammal Strength Stiff Knee Sleeves PRO showing 30 cm front height and 27 cm back height
  • Close-up of Mammal Strength Stiff Knee Sleeves PRO showing ultra-stiff 7mm high-density closed-cell CR neoprene construction
  • Mammal Strength Stiff Knee Sleeves PRO showing rebound and pop support out of the bottom of a squat using ultra-stiff 7mm CR neoprene
  • Mammal Stiff Knee Sleeves - PRO
    Mammal Stiff Knee Sleeves - PRO
  • Pair of Mammal Strength Stiff Knee Sleeves PRO shown on a gym floor, featuring ultra-stiff black 7mm CR neoprene and PRO branding
  • Two black Mammal Strength drawstring storage bags included with Stiff Knee Sleeves PRO for protection and transport
  • Close-up of Mammal Strength logo printed on ultra-stiff black CR neoprene knee sleeve fabric
  • Warranty information for a product with a 12-month warranty on a black background.
  • Trusted by over 50,000 weightlifters worldwide with verified product reviews and customer ratings
  • Size guide for Mammal Strength Stiff Knee Sleeves PRO showing quad, knee, and calf measurements for accurate sizing
1 14

Mammal Strength

Mammal Stiff Knee Sleeves - PRO

£79.95
£79.95
Tax included. Shipping calculated at checkout.
Size
Size Guide
Key Details

STIFF KNEE SLEEVES PRO: Designed for maximum compression and stability during heavy lifts. Ideal for athletes who want a locked-in feel and strong rebound under load.

MATERIAL: High-density Stiff CR Neoprene with reinforced stitching for durability and shape retention.

SLEEVE HEIGHT: 30cm

SIZING: S - XL

DESIGNED FOR: Powerlifting, heavy squats, strength-focused training, and maximal lower-body lifts.
Why Stiff Knee Sleeves?
  • Stiffer internal panel structure for maximum compression and knee stability
  • Reinforced stitching at high-stress zones to withstand heavy loading
  • Superior shape retention to maintain support over time
  • Competition-grade knee sleeves built for maximal lifts
Warranty

All Mammal Strength sleeves are covered by 12-MONTH warranty from the date of purchase.

This warranty covers defects in materials or workmanship under normal training use. It does not cover damage caused by misuse, incorrect sizing, improper care, or normal wear and tear from heavy training.

If you believe your product is faulty, contact our support team with your order number and photos - we’ll always aim to put it right.

  • Coverage: Manufacturing defects only.
  • Duration: 12 months from purchase.
  • Hurry, only 10 items left in stock!
More information View images
Pair of Mammal Strength Stiff Knee Sleeves PRO made from ultra-stiff black CR neoprene for maximum knee support during heavy lifting
Front view of Mammal Strength Stiff Knee Sleeves PRO showing ultra-stiff 7mm CR neoprene construction and PRO spec branding
Mammal Strength Stiff Knee Sleeves PRO showing ultra-stiff knee sleeve design and made-for powerlifters, weightlifters, and strongman competition use
Height measurements of Mammal Strength Stiff Knee Sleeves PRO showing 30 cm front height and 27 cm back height
Close-up of Mammal Strength Stiff Knee Sleeves PRO showing ultra-stiff 7mm high-density closed-cell CR neoprene construction
Mammal Strength Stiff Knee Sleeves PRO showing rebound and pop support out of the bottom of a squat using ultra-stiff 7mm CR neoprene
Mammal Stiff Knee Sleeves - PRO
Pair of Mammal Strength Stiff Knee Sleeves PRO shown on a gym floor, featuring ultra-stiff black 7mm CR neoprene and PRO branding
Two black Mammal Strength drawstring storage bags included with Stiff Knee Sleeves PRO for protection and transport
Close-up of Mammal Strength logo printed on ultra-stiff black CR neoprene knee sleeve fabric
Warranty information for a product with a 12-month warranty on a black background.
Trusted by over 50,000 weightlifters worldwide with verified product reviews and customer ratings
Size guide for Mammal Strength Stiff Knee Sleeves PRO showing quad, knee, and calf measurements for accurate sizing

Guarantees

  • 12-Month Product Warranty

    Covered against manufacturing defects + rip/tears for a full year.

  • 30-Day No-Quibble Returns

    Not the right fit or size? Send it back within 30 days.

  • Tested by Real Athletes

    Used daily by CrossFit, weightlifting & strength athletes.

  • Fast, Reliable Shipping

    Dispatched quickly from the UK.
800+ Product Reviews with an average rating of 4.8
Rated Excellent on Trustpilot

Stiff Knee Sleeves PRO

Stiff Knee Sleeves for Maximum Support

Stiff knee sleeves are built to deliver maximum compression, stability, and rebound during heavy lifts. Designed for serious strength athletes, they provide a locked-in feel that supports the knees under high loads.

Why Stiff Knee Sleeves?

Stiffer neoprene construction offers greater structure than standard 7mm or 5mm sleeves, helping maintain joint stability and confidence under the bar.

Best For:

Powerlifting, strongman, heavy squats, and maximal lower-body training where support matters more than mobility.

Stiff Knee Sleeves Sizing

Size guide for Mammal Strength Stiff Knee Sleeves PRO showing quad, knee, and calf measurements for accurate sizing