When you decide to take the step and buy equipment to protect your knees, you face a wall of numbers and technical terms: 5 millimeters, 7 millimeters, a single layer, double layer. What does all this mean in practice? Is greater thickness always better or will it slow you down in the middle of a hybrid workout?
Getting the measurement wrong is frustrating: you either end up with a knee sleeve so stiff that it's hard to break parallel in a squat, or you choose a fabric so soft that you don't feel any support when you load the bar.
To get it right the first time, we'll analyze technically what each thickness and each layer contributes to your biomechanics.
Guide on how to choose knee sleeves for CrossFit, HYROX, and weightlifting
Millimeters (POWER range neoprene)
Millimeters measure the thickness of the neoprene. Neoprene is a dense rubber that provides mechanical support, meaning it acts as an external structure that physically holds the knee. The more millimeters, the greater the stiffness, the higher the intra-articular pressure, and the lower the capacity for lateral torsion.
POWER 5 mm: compression for mobility
- What it provides: High compression while maintaining a fluid flexion range. It's VELITES' versatile option among neoprene knee sleeves.
- For which training: CrossFit sessions with combined loads, Olympic lifting above 80% of your 1RM that includes conditioning exercises, or heavy lunges where you need protection but also agility to move quickly.
- Athlete profile: Versatile athletes who need to feel the knee firmly held under the bar but who don't want the material to weigh them down when jumping onto a box, cycling, or stringing together fast reps.
POWER 7 mm: maximum structural stability
- What it provides: The strictest joint lock available in our knee sleeves. It drastically reduces load on the tendons and offers a powerful rebound effect at the bottom of the deep squat.
- For which training: Max strength days, powerlifting, specific heavy-squat training and attempts at maximal repetitions (1RM).
- Athlete profile: Pure lifters or athletes who prioritize absolute stability over free range of motion, as well as those who experience high joint sensitivity when the bar is loaded to the limit. Additionally, it strictly complies with IWF and CrossFit regulations, sitting at the maximum allowable thickness permitted for official competition.
Common POWER technology: Both models are manufactured with a single-piece, three-layer construction of high-resistance neoprene. They incorporate the Calf Anti-Compression System (an anatomical three-diameter shape that releases pressure at the upper calf insertion to prevent circulation discomfort) and a foldable upper design that allows you to fold the sleeve down to cushion HYROX lunges without the material bunching behind the joint.
Layers (FLOW range elastic fabric)
Layers refer to the structure of the technical fabric made from nylon and elastane. Here, we remove neoprene completely. The purpose of the layers is not to mechanically restrict movement, but to provide consistent temperature and proprioception (the speed at which your nervous system detects joint position to activate).
FLOW 1 Layer: lightness and speed
- What it provides: Light support, active thermal insulation and total breathability. It's the lightest option within VELITES knee sleeves.
- For which training: HYROX races, pure running, calisthenics, burpees, jumps and bodyweight exercises.
- Athlete profile: Athletes who want to keep their knees warm with a continuous tactile stimulus that guides movement, but who need to be able to move with agility without the sleeve limiting motion. Sweat evaporates instantly and the garment doesn't gain weight from moisture.
FLOW Double Layer: reinforced elastic compression
- What it provides: Constant medium compression and a specific reinforcement localized around the patella. It works as the perfect intermediate step.
- For which training: Intense hybrid sessions, functional training with moderate loads and high-repetition routines with a large knee volume (wall balls, continuous lunges, or sled pushes in HYROX).
- Athlete profile: HYROX and CrossFit athletes who need extra firmness and elastic stability at the patella without feeling the pressure, bulk, or stiffness that traditional neoprene produces in long-duration sessions.
Common FLOW technology: Forget fabric sleeves that slip. The entire FLOW range features an anatomical fit that respects the shape of the leg and adds a double anti-slip silicone band (strategically placed both at the upper and lower edges) to ensure the sleeve doesn't move out of place during sprints or deep squats.
(Competition note: although the FLOW range meets CrossFit technical regulations, the official rules of its competitive phases prohibit the use of multi-layer overlapping systems, so at that specific moment you must use them individually on each leg).
The golden rule of the Knee Sleeve System
How to choose then? The real answer is that you don't have to limit yourself to a single type of sleeve. Your weekly trainings change, and your equipment should adapt accordingly. VELITES' modular system allows you to combine these layers and millimeters in the same session to always have the stability and movement you need:
- FLOW 1 Layer + POWER 7 mm: Union of maximum external mechanical stability with the internal comfort of a second skin. Created for heavy weightlifting and high-load squats.
- FLOW 1 Layer + POWER 5 mm: The balanced system. Provides serious compression under load but keeps movement free for hybrid CrossFit metcons.
- FLOW Double Layer + POWER 5 mm: The thermal system. Maximum heat retention and extra layers for cold environments or joint recovery days without losing flexion.
- FLOW 1 Layer + FLOW Double Layer: The configuration for HYROX and endurance. Use the single layer for fast running segments and add the double layer when you need elastic cushioning for hundreds of wall balls and lunges.
Take control of your training
Buying a single standard pair of knee sleeves forces you to sacrifice performance on strength days or on cardio days. VELITES modular packs (available in Pack of 2 and Pack of 4 knee sleeves) offer you the complete system so you stop adapting to your gear and let the gear adapt exactly to the millimeters or layers your knees need today.
