Laerdal Sta-Blok Head Immobilizer is an easy to use, adjustable and stable constructed of soft, closed-cell foam with a padded strap and Velcro? adjustable attachment devices. The Sta-Blok is designed to adapt to virtually any patient on any backboard. The product features to ensure an easy access to ears and head without removing the device for ongoing patient assessment. The "Severe Weather/Helmet? strap provides extra stability and can be used in any type of weather condition.