Fit is overall good with the Technics EAH-AZ100, although long-term wear is subjective and relies largely on ear shape and your chosen ear tips. You are supplied with five ear tip options, starting from XS and ranging up to large, to enable a more snug fit in the ear canal. Based on Technics EAH-AZ100 reviews, extended wearing from two to three hours straight may prove slightly less comfortable, although memory foam ear tips can increase the ear grip and help prevent ear ache, therefore increasing the length the earbuds can be comfortably worn for. Finally the Technics EAH-AZ100 wireless earbuds do contain an IPX4 rating meaning they are designed to be sweat resistant. All in all, the Technics AZ100's are perfectly comfy to wear on a daily basis though anyone opting to have them on for extended durations should first assess them for fit.