Combining stylish, warm beanie hats with headphones that can be connected to your iPod, smartphone or MP3 player through a 3. 5 Mm jack (which is the same as the one used for standard headphones). The KS Audio beanie bring fashion, practicality and music together. Engineered by people who care about sound quality, the Audio beanies have been designed using technology only usually seen in high-end headphones. With their 40 mm drivers, your music will sound punchy with solid bass and retain clarity, detail and sound stage, so you can enjoy an excellent sound experience whilst keeping your head nice and toasty this winter. ACCESSORIES- EAR PHONES. Acrylic Mix.