Also, it provides like 70 extra hours of battery life which is great. The red is very nice tho. If I did not need this item the day it was delivered I would of just returned it and found another one. They ARE comfortable, and hopefully very durable. Compre este backpack sabiendo que sería muy pequeño PERO ! Overall quality is good, solid, and fairly easy to install. Just make sure you get enough length. I ordered a 10 womens, i wear a 9. They don?t slip off when running or exercising and wipe clean afterward. I did my research before buying, these were recommended and for a first time pair I wanted to not waste money on something I wasnt sure Id wear.