DON'T LET SHOES GET IN THE WAY OF YOUR BEST PERFORMANCE. what is it? Barrier4 ™ is clinically proven to prevent blisters and irritation for enduring comfort and performance. what does it do? Creates a durable, invisible barrier that blocks friction on skin where shoes rub back and forth. why is it the best? Our proprietary formulation offers 20x the protection of most blister sticks.Plus, it’s flexible, sweat-resistant and able to withstand friction for ~6 hours. why will you love it? Because now you move faster, farther and longer without the fear of your shoes causing painful blisters or cuts that slow you down. Hypoallergenic. Dermatologist Tested. Vegan. Free of Phthalates & Parabens. Cruelty Free. Made in USA. Due to government restrictions on aerosol shipments, we cannot ship Barrier4™ to Hawaii or Alaska at this time. 1.5 oz | 42.5 g