Closen AeroFlow 4.0 Resistance Mask
For endurance athletes who need adjustable mechanical resistance without interrupting their workout.
Hypoallergenic medical silicone
Fits securely on your face without causing sweat irritation or leaving marks after intense exercise.
Precise mechanical airflow adjustment
Four mechanical resistance levels with interchangeable rigid ABS valves, free of electronic components that wear out.
Manual fit inspection
Each mask is unboxed and tested at all seal points in our lab before being placed into sealed packaging.
Secure home delivery
Shipped in a protective hard carrying case via courier, with cash on delivery available upon receipt.
- ✓ Made from medical-grade silicone
- ✓ Free of toxic chemical coatings
- ✓ Durable ABS polymer valves
- ✓ Breathable neoprene strap
- ✓ Secure industrial Velcro closure
- ✓ Washable and reusable
- ✓ Airtight factory seal
Choose your training bundle
Express 1-Click Order (Name + Phone)
Selected Package: 2 Closen masks (€109)
Returns within 30 days
30-day return window from receipt under our policy terms. Contact our support team for instructions.
Proper fitting and maintenance
Ensure the ABS valves are clean and set to the desired resistance level.
Rinse the silicone with water, dry with a soft cloth, and store it in its case away from direct sunlight.
Pair mask use with rhythmic nasal inhalation and oral exhalation exercises.
Closen build versus generic imitations
The problem with cheap commercial masks
Standard masks use cheap rubber that causes irritation and air leaks as soon as you sweat. Weak fastenings loosen within the first minutes of running, ruining your pace.
Closen's durable build
We use odorless medical-grade silicone and breathable neoprene that stay completely secure through every movement. Industrial-grade Velcro and ABS valves ensure precise control without any unwanted leaks.
Five key build advantages
Truly heavy-duty materials
The mask is made exclusively from medical-grade silicone, ABS, neoprene, and industrial Velcro.
Designed for a fast pace
Ideal for interval training, rowing, track running, and cycling.
Aimed at active athletes
Designed for runners and fitness enthusiasts who want discipline in their breathing rhythm.
Tested Closen quality
Each batch is mechanically tested before packaging to ensure proper valve fit.
Honest commercial value
We offer professional equipment at direct workshop pricing without middlemen.
Material and assembly specifications
| Component / Material | Processing type | Quantity / Weight | Functional role |
|---|---|---|---|
|
Medical-grade silicone
✓ Secure grip on the skin during heavy perspiration
|
Stitch-free precision molding | 120 g | † |
|
ABS polymer
✓ Precise calibration of incoming airflow
|
Mechanical rotary valves | 45 g | † |
|
Breathable neoprene
✓ Maintains a stable temperature at the back of the head
|
Perforated breathable mesh | 65 g | † |
|
Industrial-grade velcro
✓ Prevents slipping during explosive sprints and jumps
|
Reinforced micro-hook weave | 15 g | † |
Strict manufacturing criteria
Everything you need to know
What materials is the mask made from? +
We exclusively use medical-grade silicone for the contact area, ABS polymer for the valve system, breathable neoprene for the strap, and industrial-grade Velcro for the fastener.
How do you clean it after a workout? +
Detach the neoprene strap and wash the silicone body with lukewarm water and mild soap. Allow the parts to air-dry naturally.
What payment methods are available? +
Orders are paid exclusively cash on delivery upon arrival or via bank transfer.
Can I return the product? +
We accept returns within 30 days of delivery, provided the product is unused and in its original sealed packaging. Due to hygiene reasons, opened items are accepted only if defective.
Real feedback from the training floor
"The silicone fits the face comfortably without leaving marks or slipping with sweat. The valves adjust very quickly between sets."
George P.
Customer
"Very solid neoprene build and strong Velcro. I use it for running and it stays completely secure in place."
Dimitris M.
Customer
"Delivered with cash on delivery without any issues. The material is odorless and cleans easily under the tap."
Kostas S.
Customer
Order the mask now
Fill in the shipping details on the form for immediate processing. Pay with cash to the courier or via secure online payment.