| Adult Helmets Size | Inches | Hat Size | CM |
|---|---|---|---|
| X-Small | 20 7/8 – 21 1/4 | 6 5/8 – 6 3/4 | 53 – 54 |
| Small | 21 5/8 – 22 | 6 7/8 – 7 | 55 – 56 |
| Medium | 22 1/2 – 23 | 7 1/8 – 7 1/4 | 57 – 58 |
| Large | 23 1/4 – 23 5/8 | 7 3/8 – 7 1/2 | 59 – 60 |
| X-Large | 24 – 24 3/8 | 7 5/8 – 7 3/4 | 61 – 62 |
| 2X-Large | 24 3/4 – 25 1/8 | 7 7/8 – 8 | 63 – 64 |
SENA Impulse Flip Up Helmet
*The all-new Impulse is a modular smart helmet featuring Sena’s industry-leading Mesh Intercom™ and Bluetooth® Intercom technology plus premium speakers and microphone by the audio professionals at Harman Kardon. The Impulse’s expertly tuned speakers bring a new level of precision and clarity to in-helmet audio plus an all-new microphone for unprecedented outbound audio quality. The helmet boasts an integrated rear-facing tail light for rider visibility as well as a convenient retractable sun visor. Impulse was built with a DOT-rated composite fiberglass shell and has an intermediate oval fitment. Four strategically placed vents, a chin vent, top vent, and two exhaust vents allow for airflow while riding.*
*Features:*
* Meets or exceeds DOT & ECE Standards
* Modular Helmet Design
* Premium Speakers & Microphone: SOUND BY by Harman Kardon
* Integrated Mesh & Bluetooth Intercom systems
* Multi-Channel Open Mesh Intercom supports virtually limitless riders
* Group Mesh Intercom supports up to 24 riders in a private group
* 1.2 mile Mesh Intercom range (can extend 5 mi with minimum 6 riders)
* 4-way Bluetooth Intercom (1.2 mile range)
* 18 hour talk time (varies upon intercom and taillight usage)
* Pinlock®-ready and includes Pinlock anti-fog lens
* Retractable Sun Visor
* Voice-Activated Digital Assistant Access (“Hey Google”/”Hey Siri”)
* Voice Commands in 8 languages
* Magnetic Pogo Charging Port
* Available in Glossy White & Matte Black
* Intermediate Oval Fit