The higher-entire body panels of the great-h2o, upper body-zip shorty are internally bolstered with our adaptable THERMO insulation to stop windchill in exposed spots. The seams in the Quantum Upper body-Zip Shorty two/2MM are 3D stitched and critically taped for maximum safety, as well as ??easy-in??chest-zip style stops h2o from flushing through