
A4 are primarily a manufacturer of team sports clothing based in Vernon, California.
They carried one running shoe in their footwear range from 2014, the A4 Zephyr which is a lightweight running shoe. They no longer offer footwear.
Information from the company:
- 7.5 Ounces
 - “A4 Tek” monofilament fiber technology keeps the runner’s foot cool and dry in all conditions
 - State of the art Lycra “uni-body” construction offers greater flexibility with seamless comfort
 - One piece construction brings medial support, elasticity and extended movement in the forefoot
 - Welded, not stitched TPU overlays adds support to key foot area without adding weight.
 - Stripped down construction brings slipper like comfort to a lightweight road shoe
 - A double density outsole provides greater cushioning to absorb greater foot strike shock
 
The shoe was promoted to running speciality retailers as a combination with a leg sleeve in the Fall of 2012:

Commentary:
- very little is known about this running shoe
 - Saucony have their Grid Type A4 model of running shoe that may get confused with this one
 
External Links:
A4 website | Facebook page

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