The Alpha 4.0 is a four-season textile motorcycle jacket built around a 600D Maxtex shell, a waterproof and breathable Humax membrane, and fully seam-sealed construction. It takes shoulder, elbow and back armor sold separately, so protection is added on top of the shell. The SmartVent system, removable Thermoline thermal liner and removable hood make it adaptable from cold, wet commutes to warm-weather rides. Riders rate it highly, and its main trade-off against rivals is that armor is not included.
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Riders rate the Alpha 4.0 very highly, with 4.9 out of 5 from 115 ratings. Owners treat it as a versatile, weather-ready jacket that handles rain and cold with the liner in. The most common reservation is that armor has to be bought separately.
The Alpha 4.0 is the fourth generation of the Alpha motorcycle jacket. The outer shell is Maxtex 600D for abrasion resistance. The construction is fully seam sealed, and a Humax waterproof membrane is built in. The jacket is also highly breathable.
Five SmartVent airflow vents help with ventilation. A removable Thermoline thermal lining adds warmth, and a removable wrist gaiter is attached to the liner. A removable hood attaches with a magnetic keeper. The fit has been improved over earlier versions.
The jacket accepts armor at the shoulders, elbows and back. The armor is sold separately. The 2-way main zipper has a storm flap, so the bottom of the jacket can be adjusted for your riding position. The collar, cuffs and hand-warmer pockets are comfort lined. The pockets are water resistant, and one front pocket has a hidden key/fob clip.
