Those are a starter option, but for long rides may not do. They are called bar-ends or bar-end extenstions. That is the minimum to make flat bars comfortable. On my Giant hybrid, the addition of good bar-ends did more than hand-strengthening excercises or nice gloves, but the greatest relief for long rides I experienced came when I switched to a drop bar bike. An otpion I haven't ried for long rides yet, but am intrigued by and find appealing are trekking bars (or butterfly bars) which offer a variety of curves rather than the two-poition option of flats with bar-ends. Oh, and how could I forget moustache bars! Not as many positions as trkking bars but about as many as drop bars and more than flats with bar ends.