Design intent
The S2 carries a more defined profile and a firmer edge transition than the S1, for plans where a clearly articulated result is the objective. It shares the S1's material, finish set and long-term behaviour.
Where it fits
S2 is planned where tissue supports a defined profile and where the patient wants the result to read distinctly rather than quietly. In bilateral planning it is often chosen for the symmetry a defined edge makes easier to achieve.
Practical considerations
A defined profile is more noticeable under thin fabric and more exposed to friction from clothing and equipment. Patients whose work or sport involves chest-crossing straps should raise it during planning; it is a solvable consideration, not a barrier.
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