Cook the rice vermicelli noodles according to package instructions, then drain and rinse with cold water.
Prep all vegetables and herbs, making sure everything is clean and fully dry.
Fill a shallow bowl with warm water. Dip one rice paper wrapper into the water for 5–7 seconds.
Place the wrapper flat on a clean surface and let it soften for about 30 seconds.
Layer lettuce, noodles, cucumber, carrots, herbs, and shrimp in the center of the wrapper.
Fold the bottom edge over the filling, tuck in the sides, and roll tightly until sealed.
Repeat with remaining ingredients. Keep finished rolls covered with a damp towel.
Serve immediately with dipping sauce or refrigerate briefly before serving.