Walker's Boomies Passive Hearing Protection Earmuff Extra Small Royal Plum. Designed to keep little one's protected and comfortable in any noisy setting whether indoors or outside Walker's new Boomies Passive Muffs deliver big protection for little ears. Specifications for Walkers Boomies Passive Hearing Protection Earmuff Extra Small: Manufacturer: Walkers Fabric/Material: Plastic Additional Features: Earmuff Holster Material: Plastic Blade Material: Plastic Handle Material: Plastic Features of Walkers Boomies Passive Hearing Protection Earmuff Extra Small: Designed for Smaller Head Sizes Package Contents: Walkers Boomies Passive Hearing Protection Earmuff Extra Small