Here is an interesting product idea, headphones that you can control the fit. Sennheiser offers the “Twist-To-Fit” line of headphones which offer a more secure fit perfect for when you are working out, jogging, mowing the lawn, or whatever. They come with S, M, and L adapters and will plug into any standard 3.5mm audio jack. They are also offered in a sports model with the added weather resistance.

Source: Gadgetspy