Do all FRACTEL models share the same fabric and fit?

No. The available model records list M-DAYBREAK as FLOWMESH, 58cm; L-NEPTUNE as REPREVE, 62cm; L-SAHARA as REPREVE, 59cm; and L-LUMEN as Polartec Power Dry, 62cm. These are size labels for those records, not a universal adjustment range. Compare the exact model, silhouette, material and head size together. Do not transfer one model’s Polartec fabric, UPF rating or mesh construction to another.