In a King size, 1,716 individually pocketed springs respond to movement without transferring it, each one formed from Vanadium steel for resilience that resists fatigue over years of use. The spring layer offers four tensions — Soft, Medium, Firm, and Extra Firm — and can be specified with split firmness across the width to accommodate two sleepers with different preferences. Above the springs, the upholstery features two distinct layers of natural fillings: a bonded British fleece wool and cotton layer for immediate cushioning, and a second blended layer beneath it to help moderate temperature by drawing moisture away from the body.
Both fillings breathe naturally and compact slowly to maintain the mattress profile over time. The border is hand side-stitched in two rows, binding the spring perimeter to the upholstery and preventing edge collapse for a full sleeping surface right to the boundary. Hand tufting with felt washers draws the fillings into uniform compression to stop migration or bunching, while air vents in the border enable passive ventilation through the 8.3 inches of depth, complemented by 2.4 inches of natural doming.
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