Last updated at 01/11/2026 13:08:11
Sealy Advantage Harper Firm Mattress Long Single HAR-FRM-SXL
Free delivery by Wed
| Firmness Level | Firm |
| Mattress Type | Innerspring |
| Type | Mattress |
| Length | 2030 MMT |
| Width | 915 MMT |
Sealy Advantage Harper Firm Mattress Long Single HAR-FRM-SXL
Free delivery by Wed
| Firmness Level | Firm |
| Mattress Type | Innerspring |
| Type | Mattress |
| Length | 2030 MMT |
| Width | 915 MMT |
Engineered for those who prefer firmer support without sacrificing comfort, the Harper range is a standout solution in sleep technology. This collection combines thoughtful design and durable components to deliver a mattress that holds its shape, supports your posture, and enhances rest for years to come. At the core of every Harper mattress is the trusted CoreSupport spring system. This Sealy-exclusive technology features a single-stage, twice-tempered coil system with six active turns, designed to deliver consistent deep-down support while contouring gently to the body's pressure points. It’s a perfect match for sleepers who value firmness, structure, and full-body alignment. Harper also includes the innovative EdgeGuard support system, extending the mattress’s usable surface and reinforcing its perimeter. This means a more stable seating edge and confident edge-to-edge sleep support—especially important for those who move around during the night or share their bed. HealthShield antimicrobial treatment is integrated into the comfort layers to create a cleaner, healthier sleep environment, while rigorous product testing ensures long-term performance and resilience. Perfectly paired with any Sealy base—including standard, adjustable, or storage designs—Harper brings together practicality, hygiene, and superior value. It’s an ideal choice for anyone seeking a firm feel backed by intelligent construction and trusted Australian craftsmanship.
Engineered for those who prefer firmer support without sacrificing comfort, the Harper range is a standout solution in sleep technology. This collection combines thoughtful design and durable components to deliver a mattress that holds its shape, supports your posture, and enhances rest for years to come. At the core of every Harper mattress is the trusted CoreSupport spring system. This Sealy-exclusive technology features a single-stage, twice-tempered coil system with six active turns, designed to deliver consistent deep-down support while contouring gently to the body's pressure points. It’s a perfect match for sleepers who value firmness, structure, and full-body alignment. Harper also includes the innovative EdgeGuard support system, extending the mattress’s usable surface and reinforcing its perimeter. This means a more stable seating edge and confident edge-to-edge sleep support—especially important for those who move around during the night or share their bed. HealthShield antimicrobial treatment is integrated into the comfort layers to create a cleaner, healthier sleep environment, while rigorous product testing ensures long-term performance and resilience. Perfectly paired with any Sealy base—including standard, adjustable, or storage designs—Harper brings together practicality, hygiene, and superior value. It’s an ideal choice for anyone seeking a firm feel backed by intelligent construction and trusted Australian craftsmanship.
in 1 offers
The lowest price for Sealy Harper Firm Mattress Long Single HAR-FRM-SXL right now is $451.00 at Appliances Online Australia.
The all-time low was $301.00 on 23 June 2026 — today's price is 50% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 1 Nov 2026.
Sealy Harper Firm Mattress Long Single HAR-FRM-SXL
Engineered for those who prefer firmer support without sacrificing comfort, the Harper range is a standout solution in sleep technology. This collection combines thoughtful design and durable components to deliver a mattress that holds its shape, supports your posture, and enhances rest for years to come. At the core of every Harper mattress is the trusted CoreSupport spring system. This Sealy-exclusive technology features a single-stage, twice-tempered coil system with six active turns, designed to deliver consistent deep-down support while contouring gently to the body's pressure points. It’s a perfect match for sleepers who value firmness, structure, and full-body alignment. Harper also includes the innovative EdgeGuard support system, extending the mattress’s usable surface and reinforcing its perimeter. This means a more stable seating edge and confident edge-to-edge sleep support—especially important for those who move around during the night or share their bed. HealthShield antimicrobial treatment is integrated into the comfort layers to create a cleaner, healthier sleep environment, while rigorous product testing ensures long-term performance and resilience. Perfectly paired with any Sealy base—including standard, adjustable, or storage designs—Harper brings together practicality, hygiene, and superior value. It’s an ideal choice for anyone seeking a firm feel backed by intelligent construction and trusted Australian craftsmanship.
Engineered for those who prefer firmer support without sacrificing comfort, the Harper range is a standout solution in sleep technology. This collection combines thoughtful design and durable components to deliver a mattress that holds its shape, supports your posture, and enhances rest for years to come. At the core of every Harper mattress is the trusted CoreSupport spring system. This Sealy-exclusive technology features a single-stage, twice-tempered coil system with six active turns, designed to deliver consistent deep-down support while contouring gently to the body's pressure points. It’s a perfect match for sleepers who value firmness, structure, and full-body alignment. Harper also includes the innovative EdgeGuard support system, extending the mattress’s usable surface and reinforcing its perimeter. This means a more stable seating edge and confident edge-to-edge sleep support—especially important for those who move around during the night or share their bed. HealthShield antimicrobial treatment is integrated into the comfort layers to create a cleaner, healthier sleep environment, while rigorous product testing ensures long-term performance and resilience. Perfectly paired with any Sealy base—including standard, adjustable, or storage designs—Harper brings together practicality, hygiene, and superior value. It’s an ideal choice for anyone seeking a firm feel backed by intelligent construction and trusted Australian craftsmanship.
