Balloon catheters and methods for manufacturing catheter shafts are disclosed. In one example, a balloon catheter may include an outer tubular member disposed about an inner tubular member. In some cases, a fluid (e.g. cryogenic fluid) can be provided between the inner tubular member and the outer tubular member and may cool the inner tubular member. To help provide a relatively uniform temperature distribution around a circumference of the inner tubular member, two or more spacers, protrusions, or gap-maintaining members can be positioned between the outer tubular member and the inner tubular member to maintain a gap therebetween. In some cases, the spacers, protrusions, or gap-maintaining members may be attached to an inner surface of the outer tubular member or, in other cases, to an outer surface of the inner tubular member. In other embodiments, a step-down in an outer diameter of the outer tubular member is disclosed.
