Hypnos Castle Series Foundation

Mattress Miracle Verified independent store

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Three ways to hold up a Castle Series mattress, all built from hardwood sourced from sustainable Canadian forests. The 8-inch standard foundation is the default. The 4-inch low-pro file slat box keeps the total bed height reasonable under the taller Castle models. The 10-inch full-flex adds a 6-inch Bonnell coil layer on a wood base for a touch of give under the mattress. Details Solid hardwood from sustainable Canadian forests 8" standard, 4" low-profile slat, or 10" full-flex with Bonnell coil Natural fibre covered, wicking and breathing Two bases are required for king size setups Warranty: 10 years in full, not prorated Sized single through Cal King at 2026 MSRP. Pairs with the Sherbourne, Carlisle, and Helmsley. Unsure which profile suits your frame? Call Mattress Miracle at (519) 770-0001 and we will sort it before anything is ordered. Show more