
Insurance Discount Campsite Offers All offers UK Sites French Sites European Sites Map Search Text Search Near your Location Popular Searches Leave a Review My Saved Sites Add a New Site All Sections Caravanning Camping Tent Talk Motorhomes Trailer Tents Backpacking Equipment Statics UK Campsites Camping Abroad General Chat News More Sections Latest Posts All Adverts Tents for Sale Caravans for Sale Motorhomes for Sale Equipment for Sale Post an Advert Campsite Jobs All Categories Caravanning Advice Caravan Equipment Tents and Camping Motorhomes Towing and Towcars Equipment Furniture and Cooking Electrical / Gas Shows and Events General More Categories Join for Free Log In

Message Forums

Welcome Guest

Reception - All Forums

Camping and Caravanning Equipment

The Equipment Forum is proudly sponsored by Wolfbox

Wolfbox specialise in premium mirror dash cams, portable jump starters, and vehicle safety accessories, and known for products like the Wolfbox G900 Pro with it's 12-inch touchscreen rear-view mirror dash cam. Wolfbox products are designed to enhance driving safety, with a focus on producing cutting-edge technology for modern drivers. Find out more here

Topic: sims how firm

Post Reply

billywizz1313

24/7/2013 at 9:02pm
Location: midlands
Outfit: None Entered

View Profile

Quote

Joined: 17/2/2013

Standard Member

Forum Posts: 12

Site Reviews Total:	0

Site Reviews 2026:	0
Site Reviews 2025:	0
Site Reviews 2024:	0
Site Reviews 2023:	0
Site Reviews 2022:	0
Site Reviews 2021:	0
Site Reviews 2020:	0

Site Nights 2026:	0
Site Nights 2025:	0
Site Nights 2024:	0
Site Nights 2023:	0
Site Nights 2022:	0
Site Nights 2021:	0
Site Nights 2020:	0

We have recently bought a double camp bed with 2 double outwell 5 cm sims but the sims seam to be very firm to the point of being uncomfortable do the soften with use or are some models softer than others?

mcguire6078

24/7/2013 at 9:10pm
Location: London
Outfit: Kampa Frinton 4 Classic Nevada M

View Profile

Quote

Joined: 24/6/2009

Diamond Member

Forum Posts: 2637
Tent Reviews: 3

Site Reviews Total:	2

Site Reviews 2026:	0
Site Reviews 2025:	0
Site Reviews 2024:	0
Site Reviews 2023:	0
Site Reviews 2022:	0
Site Reviews 2021:	0
Site Reviews 2020:	0

Site Nights 2026:	0
Site Nights 2025:	0
Site Nights 2024:	0
Site Nights 2023:	0
Site Nights 2022:	0
Site Nights 2021:	0
Site Nights 2020:	0

They have a foam core so should be quite soft. Are you blowing additional air into them or just letting them self inflate..?

Gareth29

24/7/2013 at 9:12pm
Location: Lincolnshire
Outfit: 5 m zig bell force 10 trigano ridge

View Profile

Quote

Joined: 22/7/2009

Platinum Member

Forum Posts: 1469
Tent Reviews: 3

Site Reviews Total:	1

Site Reviews 2026:	0
Site Reviews 2025:	0
Site Reviews 2024:	0
Site Reviews 2023:	0
Site Reviews 2022:	0
Site Reviews 2021:	0
Site Reviews 2020:	0

Site Nights 2026:	0
Site Nights 2025:	0
Site Nights 2024:	0
Site Nights 2023:	0
Site Nights 2022:	0
Site Nights 2021:	0
Site Nights 2020:	0

Lay on top of them whilst releasing the valve slightly until you get the softness required. It's what I do anyway and seems to get the result your after. The hardness is usually dependent on the amount of air inside your sim.

billywizz1313

24/7/2013 at 9:12pm
Location: midlands
Outfit: None Entered

View Profile

Quote

Joined: 17/2/2013

Standard Member

Forum Posts: 12

Site Reviews Total:	0

Site Reviews 2026:	0
Site Reviews 2025:	0
Site Reviews 2024:	0
Site Reviews 2023:	0
Site Reviews 2022:	0
Site Reviews 2021:	0
Site Reviews 2020:	0

Site Nights 2026:	0
Site Nights 2025:	0
Site Nights 2024:	0
Site Nights 2023:	0
Site Nights 2022:	0
Site Nights 2021:	0
Site Nights 2020:	0

Self inflated with one extra puff of air

mcguire6078

24/7/2013 at 9:18pm
Location: London
Outfit: Kampa Frinton 4 Classic Nevada M

View Profile

Quote

Joined: 24/6/2009

Diamond Member

Forum Posts: 2637
Tent Reviews: 3

Site Reviews Total:	2

Site Reviews 2026:	0
Site Reviews 2025:	0
Site Reviews 2024:	0
Site Reviews 2023:	0
Site Reviews 2022:	0
Site Reviews 2021:	0
Site Reviews 2020:	0

Site Nights 2026:	0
Site Nights 2025:	0
Site Nights 2024:	0
Site Nights 2023:	0
Site Nights 2022:	0
Site Nights 2021:	0
Site Nights 2020:	0

Agree with Gareth the more air inside them the more ridged they become. As suggested you could lay on them, undo the valves and expel some air until you get the firmness you prefer...

Hope this works for you!

Forum Sponsor

RTS5

24/7/2013 at 9:52pm
Location: North Wiltshire
Outfit: Elddis & 3 tents

View Profile

Quote

Joined: 25/8/2010

Diamond Member

Forum Posts: 3410
Tent Reviews: 4

Site Reviews Total:	15

Site Reviews 2026:	0
Site Reviews 2025:	0
Site Reviews 2024:	0
Site Reviews 2023:	0
Site Reviews 2022:	0
Site Reviews 2021:	0
Site Reviews 2020:	0

Site Nights 2026:	0
Site Nights 2025:	0
Site Nights 2024:	0
Site Nights 2023:	0
Site Nights 2022:	0
Site Nights 2021:	0
Site Nights 2020:	0

Yep, open valves and leave them to inflate. We have 10cm ones and leave them for a few hours, especially if they have been rolled for a while. It does no harm to leave the valves open until you are ready to use them. Once it is time for bed, lie down and release some air until you find a comfortable level. It helps if you have the valves at your head end so you can lie and do it rather than sit up to do it.

dk168

24/7/2013 at 10:53pm
Location: Devizes Wiltshire
Outfit: PVC_VWCrafter_MWB

View Profile

Quote

Joined: 19/6/2009

Diamond Member

Forum Posts: 10170
Tent Reviews: 6

Site Reviews Total:	78

Site Reviews 2026:	4
Site Reviews 2025:	17
Site Reviews 2024:	10
Site Reviews 2023:	9
Site Reviews 2022:	8
Site Reviews 2021:	9
Site Reviews 2020:	0

Site Nights 2026:	15
Site Nights 2025:	77
Site Nights 2024:	49
Site Nights 2023:	47
Site Nights 2022:	46
Site Nights 2021:	34
Site Nights 2020:	0

Were the SIM's valves closed when it was cooler and the air inside expanded in the heat during the day perhaps?

DK

-------------
Apple The Campervan - A Van For Work, Rest & Play!
- 2027: ? NL+DE+FR
- 2026: FR+DE
- 2025: 17/77
'24: 10/49; '23: 9/47;'22: 8/46; '21: 9/34
* Ex-tenter
* Treat life events like a dog: if you can't eat it, play with it or hump it, p1$$ on it and walk away!

Frog

28/7/2013 at 1:58pm
Location: Cambs
Outfit: Kampa Daymer 8

View Profile

Quote

Joined: 09/8/2004

Gold Member

Forum Posts: 350
Tent Reviews: 1

Site Reviews Total:	7

Site Reviews 2026:	0
Site Reviews 2025:	0
Site Reviews 2024:	0
Site Reviews 2023:	0
Site Reviews 2022:	0
Site Reviews 2021:	0
Site Reviews 2020:	0

Site Nights 2026:	0
Site Nights 2025:	0
Site Nights 2024:	0
Site Nights 2023:	0
Site Nights 2022:	0
Site Nights 2021:	0
Site Nights 2020:	0

It's good practice to leave the valves open on SIMS when you are not sleeping on them anyway, they can deal with temp changes easier

In order to post a reply you will need to register, or if already registered please log in here

Prev Next
Quick Links - All Forums - Camping and Caravanning Equipment - Top of Page

Latest News, Discounts and Competitions see all...

Upcoming Event

Elvaston Steam Rally 2026 03/07 to 06/07

Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.

6449 Visitors online !

Free UKCampsite.co.uk Window Sticker - Add a Missing Campsite

[Message Forums] [Caravan Sites & Camping] [Company Listings] [Features / Advice] [Virtual Brochure] [Special Offers]
[Reception] [Competitions] [Caravans & Motorhomes For Sale] [Event Diary] [Tent Reviews]

[Contact Us]

Please note we are not responsible for the content of external sites & any reviews represent the author's personal view only. Please report any error here. You may view our privacy and cookie policy and terms and conditions here. All copyrights & other intellectual property rights in the design and content of this web site are reserved to the UKCampsite.co.uk © 1999 - 2026