Its O. Not even worth its sale price! These slippers are phenomenal. How????? It looks like the product has weak cosmetic tack welds at the joints. The color is great and will match with a lot of different outfits from casual to dressy. The insulation packs out after a few uses and they certainly grow a size. Directions with the product on- line helped. I didn?t put them on, they looked used. As THE COURAGEOUS AVENGER, Johnny investigates a series of bullion shipment heists and learns that a mine owner is behind them, also that hes using kidnapped men as slave labor. In summary:Pros:Terrific Bluetooth pairing and excellent Bluetooth rangeVery comfortable in the earsStandard USB-C charging portQuite decent balance of highs and mids13+ hours on a charge (rated for 15 hours)Long cord fits comfortably behind the neckAttractive priceCons:Limited bassNo clips to keep in your ears during aggressive sportsDifferences between WI-C310 (this headphone) and predecessor WI-C300:Bluetooth:WI-C310: Version 5.