Ergonomic Shape: The block is sculpted to nest between the femurs and maintain neutral spacing of the pelvis and lumbar stack, helping side sleepers avoid rotational torque that can cause morning hip and low back pinch or sciatic flareups. Breathable Cover: Wrapped in a vented knit cover that vents heat and vapor away from the groin and thigh fold, making it tolerable for hot sleepers, pregnancy nights, or humid climates without fabric against skin becoming soaked. Pressure Relief: Unloads the upper leg weight from the lower side soft tissue, reducing shear over the trochanter bursa and knee cartilage, while dampening spine twist that otherwise drives nocturnal loops. Secure Strap: Includes an elastic hold band that keeps the block in place through tossandturn cycles, preventing pillow migration that would collapse spacing midsleep and restart compression on nerves or bursa. Use scenarios Side sleepers with morning hip or low back pinch or sciatic flareups: the ergonomic nest maintains alignment and reduces rotational torque to improve comfort through the night. Hot sleepers, pregnancy nights, or humid climates: the breathable vented knit cover helps keep the area dry and comfortable without skin irritation. Sleepers who move frequently during the night: the secure strap and stayinplace design maintain spacing, preventing loss of support and repeated nerve or bursa compression.