Just check with Gore and both shorts have Mesh insert. The difference is the padding.
C5 Pad:
Advanced Men + Women
Advanced level seat inserts with a medium density foam offer a great protection and comfort while being light and breathable. A two-layer foam construction with specifically developed supporting zones reduces pressure on soft tissue and increases blood flow in critical areas even on longer rides.
+ Windstop – INNOVATIVE SEAT INSERT TECHNOLOGY
Developed for ultimate comfort and protection, this new seat insert technology takes cycling to the next level and allows cyclists to head out straight into the elements.
CLIMATE CONTROL
Protection against the cold and wind-chill
Increased breathability and enhanced moisture management for year-round cycling
PRESSURE RELEASE
Unique, pre-formed cup prevents unwanted compression
Ensures optimum comfort and support for anatomical space
C3 Pad:
Active Men + Women
A single-layer with a less dense foam construction is used in Active level seat inserts. These inserts are scientifically developed for all cycling activities and offer the needed comfort and protection for either mountain bike, roadbike or fitness rides.