Below is a Comparison of Wind-Blox and Alternatives

  Wind-Blox Cat-Ears
Classics, Pro and Elite
Slipstreamz
Spoiler and Slip
Windfree Generic Ear Plugs
Purpose
Bike-specific Yes Yes Yes No No
 
Wearablity
Sound permeable Yes Yes Yes Yes No
Machine washable Yes No No No No
Works right or left Yes No Yes Yes Yes
Installs without removing straps Yes Yes No Yes Yes
Reflective Yes No No No No
Attaches to helmet strap Yes Yes Yes No No
 
Aesthetics
Not fuzzy or furry Yes No Yes No No
Technical materials Yes No Yes Yes No
 
Benchmarks
Wind noise stopped (%) 75.8 - 80.2% 53.3 - 77.6% NA NA Danger
Impact to Ambient Sound 0% 0% NA 74% Danger

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