Assassins Knee Sleeves - Manifesto

(15 Reviews)
$55.00 $27.50
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NEW from RockTape, the ultimate weapon for workout domination - Assassins, an entirely new generation of knee sleeves. Assassins will keep you ahead of the game--keeping your knees supported and protected while slaying reps and crushing WODs.

  • Provide joint support during grueling workouts and lifts
  • Protect the knee from abrasions during lunges or obstacle course racing
  • Provide VMO (vastus medialis oblique) support 
  • Stay put with a unique organic design, won’t slip down during activity
  • Keep the knee joint warm between exercises
  • May help reduce non-specific knee pain* 
  • May help improve patella tracking over the knee cap

Assassins can be used in a variety of sports and fitness pursuits, including: weightlifting, high-intensity interval training, obstacle course racing, running, cycling and other functional fitness endeavors.

Assassins are available in sizes extra small through extra large, with two thickness options: 5mm for moderate support and 7mm for maximum support.

Built for Competition

Assassins were formulated with the unique needs of athletes in mind, and unlike sleeves from other companies, are much more than a re-purposed medical knee support.

We fine-tuned Assassins through three years of feedback from both RockTape customers and professional athletes like Ashley Horner, Marcus Filly, and Neal Maddox to provide the ultimate knee supports.

The result is a pair of knee sleeves that are suitable for the most grueling workouts, lifting events, and obstacle course races - yet comfortable enough for the weekend warrior.

Designed for Performance

Taller than standard sleeves, and carefully constructed with a unique organic design, Assassins support the knee and compresse the vastus medals oblique (VMO) at its insertion point above the patella. This helps ensure proper stability and tracking of the knee, and can often dramatically reduce non-specific knee pain*, particularly during squats.

The extra-tall design also keeps sleeves in place - preventing excess slippage and shifting during workouts - a common complaint of competing sleeves.

Uncompromising Value

Protective gear should always be reasonably priced and available to anyone. We also believe that every athlete deserves two sleeves - that's why Assassins are always sold as a pair.

When compared to the competition, Assassins' quality and price can't be matched.

Nearly Indestructible

Engineered with a synthetic fabric shell bonded to SBR neoprene and secured via double-mauser stitching, Assassins comfortably support the knee joint through countless workouts.

Rigorous life-cycle testing by both our own athletes and automated test programs guarantee superior quality. If any pair of Assassins fails to carry out their purpose, RockTape offers the industry’s only one-year warranty against defects and premature failure from date of purchase.


SBR Neoprene
Double Mauser stitching
Durable-yet flexible front panels
4-way stretch lycra side panels
Extra tall design for VMO compression


Measure the circumference of your knee around the center of your patella.
Assassins start very snug and can take a few sessions to break in.
If you measure on the higher end of a size, we recommend ordering the next size up.

XS: 10.5" and below
SM: 10.5 - 12.5"
MD: 12.5 - 13.5"
LG: 13.5 - 14.5"
XL: 14.5 - above

Reviews (15)

Great product

Written by Stefanie Miller on 21st Dec 2020

This is my second set of knee sleeves, I had the first for over two years and loved them so much I wanted to get a new set. The quality is amazing and the fit is great.

Knee Sleeves

Written by George Reneau on 3rd Dec 2020

These are great. I've probably got 6-8 other functional fitness athletes to go to these instead of the high priced big name brands. I've tried 3 or 4 other brands and the Rocktape 7mm sleeves fit as well, last as long, look as good if Not better than those others. And they are not as expensive.

Knee sleeves

Written by Alex Esquivel on 12th Jan 2018

This this my first time ever buying knee sleeves and it feel Good wear them and I would recommend getting them if you got bad knees like me

Assassins Knee Sleeve

Written by HEIDI YALOWITZ LASSER on 21st Oct 2017

The product has given my knees the support they need for squats and jogging on the treadmill. My 60-year-old knees are creaky and can ache after activity, these give me a feeling of support..

Replaced Painlessly

Written by Friede Lundell on 10th Apr 2017

I had a pair of an older style of knee sleeves, and due to some issues had began to come apart. With a quick email and a few pictures, RockTape replaced them in the quickest, most painless customer service episode ever. The new ones arrived EXACTLY when they said they would, and the new models are even better than the first! I love them, and while I don't wear them for every work out, when I do, I know that RockTape has my knees' back.

Great product!

Written by Jon on 3rd Apr 2017

I started out with the 5mm and started wearing them for everything including running, then I picked up some 7mm for heavy lifting and they worked awesome! I have ordered several pairs for my gym colleagues and they don't like to lift without them.


Written by Luiz Guilherme Cunha on 3rd Mar 2017

One of the best knee sleeves in the market, definitely worth the price

Skeptical, but now In Love

Written by Stephanie H on 1st Jan 2017

At first, I had avoided incorporating "equipment" into my lifts; after my first heavy squatting session using the assassains, I was absolutely in love. They made an enormous difference in my comfort at full depth, and fit very true to size.

Stronger for longer

Written by evan smith on 26th Nov 2016

Hands down best knee sleeves I've ever had. I "had" many other knee sleeves in the past and when you have a 30 inch waist with 34 inch legs it's hard to find a reliable pair of sleeves that can take the abuse for my knees. The new assassins are awesome, they haven't let me down and can't imagine they will. Thanks rocktape for me making me go stronger, longer.


Written by Melissa Smith on 8th Nov 2016

I love the support this product gives my knees! Heavy Lifting and no issues since I began wearing...

Completely Stoked

Written by Bryan Smith on 27th Oct 2016

Having completely torn my quad off from my knee I wanted a knee sleeve that would hold up and not have to keep adjusting thru my workout. This has sleeve is everything Rocktape said it would and recommend it.

Warranty is as good as the product

Written by Zachary Hutchings on 8th Oct 2016

Bought rock tape kneecaps in the 7mm and had them rip on me about 6 months into using them. After finding out that rock tape had warranty I filled out the application online with a couple pictures of the rips (very minor) and they sent me the updated/upgraded assasins knee sleeves for no extra cost. Service is the bees knees and the assasins feel awesome. The increased length makes a big difference compared to the knee Caps and they feel stronger too.

Best ever

Written by Plo on 2nd Sep 2016

Great fit first time on

Love these knee sleeves

Written by Matthew Francis on 25th Aug 2016

Have always loved Rocktape knee sleeves but these feel even better than the knee caps.

Best knee support

Written by Irene on 11th Aug 2016

Tried several products, but these are the best support I've gotten for my knees. I powerlift and I wouldn't be able to squat or deadlift as heavy as I do without these babies. Everyone who lifts should have these to protect their knees!

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