6D ATS-1R Motorcycle Helmet - Alpha - Silver - 2XL 30-0589 Trk 502 2017/2020 Head diameter is 3-1/2" for

Head diameter is 3-1/2" for a good view and a clean look

Feature 16-gauge steel construction

Heavy-duty 1/4" x 5/16" stainless steel rivets

IC Duct5 Uses a three-position slide gate to improve sealing for reduced noise and water intrusion

5 inches x 4

6D ATS-1R Motorcycle Helmet - Alpha - Silver - 2XL 30-0589 Trk 502 2017/2020 Head diameter is 3-1/2" forImproved fit, larger shell opening 3K carbon fiber shell Improved impact management system, shield base plates and sealing Anti scratch shield (certified VESC 8) Tool less shield changing 10 position shield adjustment with lockdown lever UV protection Clear PINLOCK 120 anti fog insert included Internal breath guard directs fresh air up the inside of the shield, while exhausting breath down and out to reduce fogging 4 adjustable intake ports channel