Bring a pot of salted water to a boil. Add the shrimp and squeeze in a lime wedge for flavor. Boil for 2-3 minutes, until the shrimp are pink and opaque. Drain and let cool, then slice each shrimp in half lengthwise.
Set up your workspace with a large bowl of warm water, a clean towel, all the prepared vegetables (cucumber, carrot, cabbage, lettuce), herbs (mint, cilantro), and shrimp halves.
Submerge one rice paper in warm water for 10-20 seconds, until just softened but still a bit firm—it will continue softening as you assemble.
Lay the softened rice paper flat on the towel. At the lower third of the wrapper, layer a piece of lettuce, a small handful of cabbage, strips of cucumber and carrot, and a few sprigs each of mint and cilantro.
Lay 2 shrimp halves above the vegetables, cut-side down and pink-side up—this gives the roll a classic look with shrimp visible through the wrapper
Fold the left and right sides of the rice paper inward toward the filling. Fold the bottom of the wrapper up over the filling, then roll tightly upward, enclosing all ingredients. The finished roll should be taut and sealed.
Repeat with remaining wrappers and ingredients. Serve immediately with your preferred dipping sauce.