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From SPRE microfiber at 0.8D–1.5D to SuperLoft+ at 12D–25D, this guide explains typical denier roles for pillows, duvets, cushions and padding, and why sampling still decides the grade.

The S in HCS is a silicone surface finish, not the hollow core or 3D crimp. SPRE’s slick finish is a slippery flame-retardant oil that can meet BS5852.

Hollow versus solid and 3D versus mechanical crimp are two separate choices. SPRE compares filling resilience, blending with LMF for wadding or padding, and needle-punch or carpet yarn.

Mechanical crimp, 3D crimp and permanent crimp are not options on the same axis. SPRE explains process, shape and lasting crimp, then maps them to hollow conjugate and hollow mechanical PSF.