FREE Shipping Over $50 - Usually Ships Within 24 Hours - Expedited Shipping Available The OptiO2 Sport™ combines the performance enhancing benefits of training with a mouthguard and the physiological benefits of optimal breathing to provide the ultimate training aid. The patent-pending design enforces proper breathing technique by allowing nasal airflow only while opening the airways with an elevated tongue and forward jaw. This along with the inclusion of the bite pad provides a list of benefits that every serious athlete can benefit from, including: improved oxygen delivery to muscles and tissues natural production of nitric oxide (NO) reduced rate of dehydration increased strength Increased reaction time increased range of motion reduced cortisol production faster post-workout recovery. RECOMMENDED FOR: All non-contact sports training, basketball, golf, weightlifting, CrossFit, Track & Field * NOT RECOMMENDED FOR USE AS PROTECTION DURING CONTACT SPORTS Material: EVA BPA, phthalate and latex-free   DISCLAIMER: Consult with your physician before beginning any program that includes OptiO2 LabsTM. If you have any known illnesses, especially those of a respiratory or cardiovascular nature, consult with your doctor before using. Not intended for protective use. Use OptiO2 LabsTM products at your own risk.

If you know you know. The mark of an elite athlete is in the details. Let the world know you're top tier. Nasal breathing = Increased natural production of nitric oxide (NO) It feels soft and lightweight, with the right amount of stretch. It's comfortable and flattering for both men and women. • 100% combed and ring-spun cotton (Heather colors contain polyester) • Ash color is 99% combed and ring-spun cotton, 1% polyester • Heather colors are 52% combed and ring-spun cotton, 48% polyester • Athletic and Black Heather are 90% combed and ring-spun cotton, 10% polyester • Heather Prism colors are 99% combed and ring-spun cotton, 1% polyester • Fabric weight: 4.2 oz (142 g/m2) • Pre-shrunk fabric • Shoulder-to-shoulder taping • Side-seamedSize guide   XS S M L XL Length (inches) 27 28 29 30 31 Width (inches) 16 ½ 18 20 22 24

If you know you know. The mark of an elite athlete is in the details. Let the world know you're top tier. Nasal breathing = Increased natural production of nitric oxide (NO) • 50% polyester/25% combed ring-spun cotton/25% rayon • Fabric weight: 4.2 oz (142 g/m2) • Raw edge seams • Fabric is laundered to reduce shrinkageSize guide   XS S M L XL Length (inches) 25 ⅞ 26 ½ 27 ⅛ 27 ¾ 28 ⅜ Width (inches) 15 16 17 18 19 ½