In-Store

• 25cm Deep Mattress with 250mm Medical Grade™ Foam Core

• 5-Zone PostureCell® Technology for total body contouring

• Fall Asleep 29% Faster · 7% Greater Sleep Efficiency · 21% More Restorative Sleep

• 46% More Pressure Relief & 69% Faster Cooling than memory foam

• Hypoallergenic, Removable & Washable Cover

• Encapsulated Edge Support — maximises sleep surface and reduces roll-off

• 5-Year Guarantee + 5-Year Sliding Warranty

• Handmade in the UK

Firm
Firm yet adaptive — relieves pressure across your whole body, with softer zones where you need comfort most and firmer support through the lumbar for healthy alignment.

The Performance Pure mattress by Mammoth is built with Medical Grade™ Foam — a breakthrough material developed in healthcare and proven to outperform memory foam in pressure relief, cooling, and responsiveness. Independent testing shows it helps you fall asleep 29% quicker, achieve 7% greater sleep efficiency, and enjoy sleep that is 21% more restorative. It also delivers 46% more pressure relief and cools 69% faster than memory foam, so you wake up free from stiffness, overheating, and discomfort.
At its core, 250mm of Medical Grade™ Foam works with Mammoth’s 5-Zone PostureCell® Technology, which adapts instantly to every contour. Softer zones at the shoulders and hips cradle your body, while firmer lumbar support ensures correct spinal alignment. Encapsulated edge support reinforces the perimeter, giving you more usable space and preventing roll-off.
Finished with a removable, washable cover treated with Micro-Fresh® antibacterial protection and Algua™ fabricenriched with antioxidants, Performance Pure is fresh, breathable, and designed to keep you healthier night after night.
Choosing a Mammoth means choosing proven healthcare innovation — a mattress that supports your long-term health, recovery, and wellbeing, every single night.

📏 Available Sizes
3’0 Single · 4’6 Double · 5’0 King · 6’0 Super King

👤 Who’s It Best For?

• People who want a firm, spring-free mattress that adapts instantly to the body

• Sleepers with back, joint, or posture-related issues

• Allergy sufferers who need a hygienic, washable sleep surface

• Athletes, shift workers, and anyone focused on recovery and wellbeing

🔍 What’s Inside?

• Medical Grade™ Foam (250mm): Scientifically developed in healthcare, proven to outperform memory foam in pressure relief and cooling

• 5-Zone PostureCell® Technology: Zoned cells flex in every direction for total contouring — softer at shoulders/hips, firmer at lumbar

• Encapsulated Edge Support: Reinforced perimeter to maximise space and keep the mattress stable edge-to-edge

• Cooling Performance: Tested to cool 69% faster than memory foam for a fresher night’s sleep

• Micro-Fresh® Treatment: Antibacterial, hypoallergenic, odour-resistant cover

• Algua™ Fabric Cover: Infused with natural antioxidants and minerals for skin-friendly comfort

• Spring-Free Design: Quiet, movement-absorbing support with no partner disturbance

We provide delivery to the room of your choice, unpack the mattress and bed, assemble it, and remove all packaging materials. If you request, we can also take away your old mattress or bed and recycle it responsibly.

Free Delivery

Saffron Walden CB11 | Chelmsford CM1 | Brentwood CM14, CM15 | Epping CM16 | Harlow CM17, CM18, CM19, CM20 | SawbridgeworthCM21 | Hatfield Heath-Hatfield Broad Oak CM22 | Bishop's Stortford CM23 | Stansted CM24 | Ingatestone CM4 | Ongar CM5 | Great Dunmow CM6 | Broxbourne EN10 | Hoddesdon EN11 | Cheshunt EN7 | Waltham Cross EN8 | Waltham Abbey EN9 | Loughton IG10 | Chigwell IG7 | Buckhurst Hill IG9 | Stapleford Abbotts RM4 | Much Hadham SG10 | Albury, Hertfordshire SG11 | Ware, Hertfordshire SG12 | Hertford SG13, SG14 | Buntingford SG9 |

Free Delivery Over £500 Or £30 Charge for Under £500

St Albans AL1 | Hatfield, Hertfordshire AL10 | London Colney AL2 | St Albans AL3, AL4 | Harpenden AL5 | Welwyn Garden City AL6, AL7, AL8 | Hatfield, Hertfordshire AL9 | Saffron Walden CB10 | Southeast Cambridge CB21 | Cambridge CB22 | Billericay CM11, CM12 | Brentwood CM13 | Chelmsford CM2, CM3 | Braintree CM7, CM77 | Witham CM8 | London Borough of Waltham Forest E10, E11 | Manor Park, London E12 | Walthamstow E17 | London Borough of Redbridge E18 | Chingford E4 | London Borough of Enfield EN1 | Enfield EN2, EN3 | Chipping Barnet EN4, EN5 | Potters Bar EN6 | Ilford IG1, IG2, IG3, IG4, IG5, IG6 | Woodford Green IG8 | Romford RM1 | DagenhamRM10 | Hornchurch RM11, RM12 | Rainham, London RM13 | Upminster RM14 | South Ockendon RM15 | Grays RM16 | Romford RM2, RM3, RM5, RM6, RM7 | Dagenham RM8, RM9 | Stevenage SG1, SG2 | Knebworth SG3 | Hitchin SG4 | Letchworth SG6 | Baldock SG7 | Royston, Hertfordshire SG8 | Wickford SS11, SS12 | Basildon SS13, SS14, SS15, SS16 | Borehamwood WD6 | Radlett WD7 |

Free Delivery Over £800 Or £50 Charge for Under £800

Cambridge CB1, CB2, CB3, CB4, CB5 CB23, CB25 | Willingham, Cambridgeshire CB24 | Ely, Cambridgeshire CB6, CB7 | Newmarket, Suffolk CB8 | Haverhill, Suffolk CB9 | Maldon CM0, CM9 | Sudbury, Suffolk CO10 | Colchester CO2, CO3, CO4, CO5, CO6 | Mount BuresCO8 | Halstead CO9 | Whitechapel E1 | Plaistow, Newham E13 | Canary Wharf E14 | Stratford E15 | London Borough of Newham E16 | Wapping E1W | Bethnal Green E2 | Bow E3 | Clapton E5 | East Ham E6 | Forest Gate E7 | Dalston E8 | London Borough of Hackney E9 | Stanmore HA7 | Edgware HA8 | Hemel Hempstead HP1, HP2, HP3 | Tring HP23 | Berkhamsted HP4 | Chesham HP5 | Barking, London IG11 | Bury St Edmunds IP28 | Barrow, Suffolk IP29 | Luton LU1, LU2, LU3, LU4 | Dunstable LU5, LU6 | Flitwick MK45 | Islington N1 | Kingswood, Surrey N10 | New Southgate N11 | North Finchley N12 | Palmers Green N13 | Southgate N14 | Seven Sisters N15 | Stoke Newington N16 | Tottenham N17 | Edmonton, London N18 | Archway N19 | Finchley N2, N3 | Whetstone N20 | Winchmore Hill N21 | Wood Green N22 | Finsbury Park N4 | Highbury N5 | Highgate N6 | Holloway, London N7 | Crouch End N8 | Edmonton, London N9 | London Borough of Camden NW1 | Harlesden NW10 | Golders Green Estate NW11 | Cricklewood NW2 | Hampstead NW3 | Hendon NW4 | Kentish Town NW5 | Kilburn, London NW6 | Mill Hill, Gauteng NW7 | St John's Wood NW8 | Colindale NW9 | St Neots PE19 | Grays, Essex RM17, RM20 | TilburyRM18 | Purfleet RM19 | Arlesey SG15 | Henlow SG16 | Shefford, Bedfordshire SG17 | Biggleswade SG18 | Sandy, Bedfordshire SG19 | Hitchin SG5 | Westcliff-on-Sea SS0 | Southend-on-Sea SS1, SS2, SS3 | Stanford-le-Hope SS17 | Rochford SS4 | Hockley SS5 | Rayleigh, Essex SS6 | South Benfleet SS7 | Canvey Island SS8 | Leigh-on-Sea SS9 | Watford WD17, WD18, WD19, WD24, WD25 | Bushey WD23 | Rickmansworth WD3 | Kings Langley WD4 | Abbots Langley WD5

1 Year Free Replacement

2 Year Free Replacement

3 Year Free Replacement

4 Year Free Replacement

5 Year Free Replacement

• Rotation: Rotate head-to-toe weekly for the first 6 months, then once a month afterwards for even wear

• Cleaning: Lightly vacuum with an upholstery attachment; spot clean gently with a mild detergent and damp cloth — never soak

• Protection: Always use a mattress protector to guard against spills, allergens, and moisture, helping preserve comfort and warranty