Delivery to UK Mainland from £2.50
  • PayPal
  • Visa
  • Mastercard
14 Day Refunds & Return Policy

OUTLET: XLR Inner Core Undersuit


The Inner Core undersuit is manufactured from a lightweight, high performance insulating material, designed to reduce air movement and reflect thermal radiation.

This undersuit will also retain its insulating qualities when wet or compressed.

Although regular insulators break down after frequent washing, the quilted construction of the Inner Core will retain its thermal integrity throughout the life of the garment.

This undersuit has a tog rating of 2.3.

Limited Stock - XLR ONLY

Delivery, Returns & Instore Collection

When will I receive my order?

International Delivery Times

Monday – Friday 3 – 5 Working Days

UK Mainland Delivery Times

Monday – Friday before 2pm Next Working Day
Monday – Friday after 2pm 2 Working Days
Saturday & Sunday 2 Working Days

UK Extended Areas Delivery Times

Monday – Sunday 3 – 5 Working Days

Please note delivery times may be extended during busy periods.

EU Areas

Please note that due to changes by HMRC, orders being shipped to EU countries will not be shipped on the same day as they are invoiced. EU Orders will now be shipped on the next working day. This only applies to E.U. orders. Domestic and Worldwide shipments remain the same.

Collect In Store?

When you go to the online checkout, you can opt to collect your items in store. We'll let you know when your order is ready for you to collect. Your order will normally be ready to collect the next working day.

Returns, refunds or exchanges?

You can return any item within 28 days of receipt for a refund, provided the item is unused, in its original packaging and in 'as new' condition.

Items will be refunded in full (less postage) if received within 28 days from the date of despatch.


We aim to deal with all returns and exchanges on the day they arrive, however please allow longer during peak periods.

You can return the item(s) by dropping them off in store or by returning the item(s) by post. We do not insist on a specific courier service for the return, so please use the most economical or appropriate method for returning the item(s).

Northern Diver (Int) Ltd
Appley Lane North
Appley Bridge

If an item becomes faulty after a period of time then please contact customer services (01257 254 444 or prior to returning the item. We will either repair or replace the item at our discretion.

Tell Us What You Think

Customer Reviews

5 out of 5 Stars (2 reviews)

Write a Review

Undersuit Comfort to the Core

By Ron Lees on 01 May. 2016

Firstly, I have to say, that the ‘male model’ you have used really sold this undersuit to me ;-) On a serious note, this undersuit is just perfect, in conjunction with a thick neoprene drysuit. I sometimes use an old style ‘thick’ Ndiver drysuit, that I just can’t part with. This Inner Core undersuit is just a touch thinner than my trusty Metalux 100g, which has served me well (under my thinner drysuit) for years. However, under my thick suit, the Metalux 100 was just a bit too thermal. I previously tried the Northern Diver Thermalux and found that it wasn't quite thermal enough, for use in colder waters. This Inner Core undersuit just hits the mark, comfortably warm, really flexible and simply a joy to use. I now have the perfect drysuit and undersuit combo situation, happy diver.

Great under suit for the money!

By Mikolaj on 03 Jan. 2017

I have only used it on 2 dives now but I have some feedback that I think it will be handy for other potential buyers. So I'm 6.1 tall and weight around 105KG, I'm of average build. The under suit in size XL fits me perfectly! Now the good: This under suit works great with my 5mm neoprene dry suite. I was diving in waters from 12C to 15C and I have felt hmmmm, perfect :) Also I wore nothing under it (well just pants!) so in cold winters a pair of thin thermals should be perfect! I also got it slightly wet and it dried almost instantly! And yeah 2 pockets are handy! The Bad: Well I use neoprene seals on my dry suit sleeves, now the sleeves in the under suit are quite tight and I can't roll them up enough to have better seal on the dry suit... In the result the sleeves always get little bit wet. Not a fault of the undersuits though. No drama there! Another thing is, 5mm neoprene dry suit limits your movement a little bit, mixed with this under suit it feels a little bit like diving in a 7mm wet suite :P, well maybe not so bad but you have idea now! ..... Conclusions: ...Great value under suite!


Trade Customers

Northern Diver offers trade accounts. Please click here to register your details and find out if you qualify. Once your trade account has been confirmed you can view all trade prices and shop easily online when logged into your account. Please note when you are not logged in to your trade account retail prices are shown. If you have any queries please do not hesitate to contact us. Tel: +44 (0) 1257 25 44 44.