Wind Noise Reduction Products

There are now six 'passive' wind noise reduction products on the market. We purchased the products

pictured below between 2016 and 2017. Please visit the respective websites for possible product updates.

In addition to the five products pictured above, a product called 'Helmet Angel' recently entered the market.

Note: In our opinion, any manufacturer making claims regarding the aeroacoustic effectiveness of a device should demonstrate the validity of such claims, including the presentation of test data and the specific methods used to validate the claims. (R. Weissner, Managing Director, Cat-Ears, LLC)

Original Wind Noise Reduction Products


Slipstreamz Win Noise Reduction

Based in South Africa, Slipstreamz are made in China. The Spoilers retail for about $10.00.


Slipstreamz makes no decibel related performance claims.

"Slipstreamz Spoilers are unique in using the front strap of your helmet to smooth the airflow over the side of your head and ears for improved cycling performance, enjoyment and safety."

 - Slipstreamz website.

Please visit the Sipstreamz website ( for more information


Windrush Wind Noise Reduction

Based in the UK, Windrush products are also made in the UK and retail for about $30.00.


Windrush claims to reduce wind noise by 20-25 decibels

"Reduce wind noise by 75%. Hear approaching vehicles. Hear conversations. Hear your music. Hear everything except the wind. No muffling of voices or other sounds. Interconnected cells allow the passage of other sounds through to the ear... unique Air Still™ material around the ears counters wind noise yet allows all other sounds through..." - Windrush website.

Please visit the Windrush website ( for more information


Windfree Wind Noise Reduction

Based in Sweden, Windfree AB products are made in China and retail for about $35.00.


"According to wind tunnel tests at KTH, Windfree products can reduce the noise caused by wind by as much as 20 decibels." (KTH Aeronautical and Engineering Sciences, Royal Institute of Technology, Stockholm, Sweden) - Windfree website (i.e. up to 75% reduction)


Windfree comprises a foam with a cell structure that allows sound to pass but not wind.  We have simulated the ears of fast animals, which are protected by fur." -  Windfree website.

Please visit the Windfree website ( for more information

Cat-Ears / AirStreamz

AirStreamz Wind Noise Reduction

Introduced during 2012, Cat-Ears products are made in the USA and retail for about $16.00. 

Our products reduce perceived wind noise by 60% to 75%.  While the amount of perceived wind noise reduction can vary (based on speed, turbulence, etc.), we stand behind our products as the most effective strap devices of their kind on the market." - Cat-Ears website

"Our new AirStreamz™, based on PileTech™ materials science / engineering, are recommended for Casual to Competitive Cyclists.  Developed through aerodynamic / acoustic research, AirStreamz™ are made from proprietary Acoustic Pile materials that dampen / dissipate / deflect oncoming wind while reducing the intensity of wind noise producing turbulence."  - Cat-Ears website

Products Similar to Previous Designs / Concepts


Introduced during 2013, Wind~Blox are imported from Pakistan and retail for about $18.00

Wind~Blox claims to "stop over 80% of bicycle wind noise".  During 2015, they issued a press release claiming a "25.2 dB (80.2%) wind noise reduction".  Given these obvious 'too good to be true' claims, we evaluated the 'Without Wind~Blox' and 'With Wind~Blox' audio files from the Wind~Blox website.  We ran the files through professional audio analysis programs.  Based on the results, it appears that the correct effectiveness is less than 60%.

A few other observations regarding Wind~Blox (W~B) are highlighted below:

  • W~B claims to have received an award for "Most Effective Wind Noise Reduction." Unfortunately... there is no such award.  Perhaps the claim helps sell products.

  • W~B has used fictitious names on numerous cycling forums to promote products. When caught, forum moderators closed, banned, and / or deleted their accounts.

  • W~B claims that Windfree has an adverse "Impact to Ambient Sound" of 74%.  This is an absurd assertion.  W~B incorporate closed cell foam inserts.  Not Windfree.

Given the false / misleading claims, Wind~Blox risks disappointing customers and damaging

others in the wind noise reduction industry.  Click here to learn more about Wind-Blox.

Helmet Angel

Helmet Angel Reduces Wind Noise

Based in the UK, the Helmet Angel product is made in the UK and retails for about $20.00.


Helmet Angel makes no decibel related performance claims.

The product is similar to a wind deflecting design that was developed during the 1990's (see below). "Hear more clearly and react more swiftly to what is happening around you when you cycle... Researchers found that the shells made a massive difference in enabling riders to hear sounds behind them" - From the Helmet Angel website

"Helmet Angel is the brainchild of David Crampton." - From the Helmet Angel website

Please visit the Helmet Angel website ( for more information

Discontinued Wind Noise Reduction Products

Silencer (1992)

This product appears to have been developed during the early 1990's.

Silencer - "Reduce Wind Noise"

This is the original hard plastic wind deflector. Razor style grip for secure helmet strap attachment. Made from hard plastic, the obvious sound blocking aspect of this design would be our biggest safety concern.

The Helmet Angel product (see above) is similar to the Silencer.

Windfoil (2004)

This product appears to have been available from 2004 until about 2008.

Windfoil - "Hear The Difference"

"Wind noise is created by air rushing past the folds of the ear...  Windfoil's lightweight polymer surface uses patented MicroVents to create a laminar airflow. This prevents unwanted wind noise while permitting ordinary sound to pass through. WindFoils easily clip to your helmet straps and fit comfortably over your ears." - Windfoil

Cycling forum comments regarding the Windfoil were mixed.

D:flekt (2015)

This product appears to have been available for a limited time during 2015.

D:flekt - "Wind Noise Reduction Device"

"Wind noise generated when cycling is not only annoying but reduces your ability to hear clearly when moving. The faster you go, the worse it gets. D:flekt helps greatly reduce the effects of wind noise on your hearing so you can hear what's going on around you or hear the feedback from your favorite cycling app or music without having the volume at dangerously loud levels." - D:flect

The D:flect product may have had very limited availability.

Homemade Versions

  Predating the Wind~Blox and Helmet Angel products

Cat-Ears / AirStreamz is a leading manufacturer of aero-acoustically designed passive wind noise reduction products.  Tested and recommended by respected publications and professionals, Cat-Ears / AirStreamz are the highest rated and best selling products designed for serious cyclists / outdoor sports enthusiasts.  Our products are 100% Satisfaction Guaranteed and Made in the USA.

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