U.S. Mattress Brand Evidence Profile
Does a Kirkland Signature (Costco Private Label) Mattress Have Fiberglass? (Law Tag & Material Teardown)
Independent analysis of Kirkland Signature (Costco Private Label): operating parent company Costco Wholesale Corporation (NASDAQ: COST), manufacturing facilities in Certified Domestic Bedding Fabrication Facility (Issaquah, Washington, USA), Uniform Registry Number (URN: State Bedding License (Issaquah, Washington, USA)), and 2026 flammability barrier safety disclosures.
Flammability & Safety Forensics
2026 Fiberglass Determination: NO (Clean 2026)
Inherently Flame-Resistant Viscose Rayon infused with Hydrated Silica (Glass-Free)
Phased out glass fiber by late 2023 / early 2024 across all production lines
Law Tag Disclosure: DO NOT REMOVE COVER / Inherently Flame-Retardant Rayon Barrier | Zero active class actions; certified compliance with CPSC 16 CFR Part 1633
Clean Record
Manufacturing & Industrial Geography
Factory Footprint & Ownership Lineage
Costco Wholesale Corporation (NASDAQ: COST) (Founded 1983)
Regional / Contract Co-Packer Fabrication · Made in USA from Domestic & Imported Materials
Certified Domestic Bedding Fabrication Facility (Issaquah, Washington, USA)
State Bedding License (Issaquah, Washington, USA)
Evidence Citation: State Bedding Registration & Official Corporate Disclosure (Verified Source URL ↗)
Complete Model Lineup
All 2 Documented Models (0 Active, 0 Legacy)
Kirkland Signature by Stearns & Foster Hope Bay Plush
Series: Hope Bay · Hybrid (Pocket Coil + Foam) (14.5" profile)
Feel: Medium-Plush (5.5/10) · MSRP: $1,199
Fire Barrier: Inherently Flame-Resistant Viscose Rayon infused with Hydrated Silica (Glass-Free)
Kirkland Signature 12" Gel Memory Foam
Series: Gel Memory Foam · Hybrid (Pocket Coil + Foam) (12" profile)
Feel: Medium-Firm (6.5/10) · MSRP: $499
Fire Barrier: Inherently Flame-Resistant Viscose Rayon infused with Hydrated Silica (Glass-Free)