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Buffalo Systems Mountain Shirt - Olive Green

Buffalo Systems

Buffalo Systems Mountain Shirt - Olive Green


Weight: 670 g         31 reviews
The Buffalo Mountain Shirt is a unique fleece-lined garment, designed as an all-in-one base-layer and outer jacket. It's perfect for various cold-weather activites, such as hill-walking, fishing, climbing, and trekking, as well as for general outdoor use.

Buffalo originated this one-layer system in the late 1970's, to replace the numerous layers often worn by climbers, fell runners and hill walkers in winter conditions. It comprises a lining of insulating pile fleece, with a functional and water-resistant shell outer, producing a garment that is completely windproof, lightweight and amazingly warm. It is also highly breathable and extremely efficient at transmitting moisture vapour.

As unconventional as it sounds, the Mountain Shirt is designed to work most efficiently when worn next to the skin. In this way, the pile fabric wicks moisture away from the skin more rapidly, where it is then dispersed by the Pertex to the external surface to evaporate and keep the body dry and free from chilling. Side zips have been fitted, not only allowing access, but to adjust for ventilation, enabling the user to regulate their body temperature on the move.

Buffalo Systems are dedicated to producing clothing for the professional and committed outdoor activist. All Buffalo products are rigorously tested through an entire season of Scottish winter and often longer. All components, from zips to thread, are of the highest quality and are equally tested.

Sizing: Buffalo have designed the Mountain Shirt to be a very close-fitting garment, to ensure maximum performance. Strictly speaking, the looser the fit, the less performance you will get. We recommend you measure your chest when completely expanded, and choose your size using this measurement. The Mountain Shirt is a mid-length top, which finishes at the top of the thigh.

  • Windproof and water-resistant Classic Pertex outer shell
  • Windproof to 50 mph
  • Aqua Therm pile lining
  • Highly breathable
  • Neck zip with storm baffles
  • Two-way side zips for access and ventilation, with storm baffles
  • Zipped map pocket with weather flap
  • Aqua Therm pile-lined hand-warmer pocket
  • Tape and buckle waist adjuster (inside hand warmer pocket)
  • Eight ventilation controls
  • Rucksack hip belt can be fastened through hand warmer pocket
  • Scooped back (10cm longer than front)
  • Touch and Close strip around collar for attachment of hood
  • Touch and Close cuff and hem adjusters
  • Colour: Olive Green
  • Weight: 670g (in size 40)
  • Machine washable
  • Made in Great Britain

Out of Stock in 2 sizes:

• 38 inch chest
• 40 inch chest

This item is out of stock in 2 sizes. To be notified by e-mail as soon as new stock is released in a particular size,  please sign up for a restocking notification below.


  Delivery in 1-2 days within the United Kingdom
  UK Orders placed before 2PM GMT will be dispatched the same working day
  Overseas delivery times will vary depending on the destination

Please note that our offices are closed at weekends, so any orders placed after 2PM GMT on a Friday will not be dispatched until the following Monday.

Orders with a total value over £300.00 will be dispatched free via a next day delivery service within the UK at no extra cost.

Please note that in some instances, orders for heavy items may take an extra day to arrive.

  Overseas deliveries
For overseas deliveries, please refer to the following estimated delivery times:

  • Europe: 3 - 5 working days
  • Rest of the world: 5 - 7 working days


A full refund or exchange will be given provided that the items have not been worn or used, and are returned to us within 30 days of purchase, together with all relative labels and packaging. You are responsible for the cost of returning items.

Please ensure that you include a copy of your invoice, along with an explanation of why you have returned your goods. If you wish to return your goods for any reason, please do so to the following address:

Woodlore Limited
PO Box 3
East Sussex
TN19 7ZE
United Kingdom

Product Reviews

Buffalo Systems Mountain Shirt - Olive Green is rated 5/5 based on 31 customer reviews.

All of our product reviews are from customers with verified purchases.

Overall Rating:


  1 of 31

  Great jacket, exactly what I hoped for. Warm, practical and looks great! Would recommend.  

1st February, 2023

Rated: 5/5

  2 of 31

  First of all, the order process was easy and the delivery speedy. The top is the second I have bought, but in a different colour. I am a big fan of them and I use it regularly when temperatures start to drop. I did read up on the top before I bought it and that is worth doing for such an investment.  

  Iain Mckenzie Findlay
4th September, 2022

Rated: 5/5

  3 of 31

  Great colour, not quite waterproof but offers good breathability. Works best without anything on underneath, but ensure it has a tight fit. Use the straps to adjust otherwise can feel a little cold for colder people. Others I know found it enough.  

21st June, 2022

Rated: 4/5

  4 of 31

  Fantastic jacket, though the weather is getting a bit too warm for it now so looking forward to wearing it much more in Autumn and Winter. The zips are great for ventilation though, plenty of opportunity to get a bit of cool air circulating through. The pockets - both the hand one and the large front one are great, so there is no need for gloves in cooler weather and there is lots of room for a map, keys, etc in the front chest pocket. Great price, significantly lower than other retailers, I'm very happy.  

  David Gilbert
26th April, 2022

Rated: 5/5

  5 of 31

  A replacement for old mountain shirt which was 14 years old, it's identical to the old shirt except the central hand pocket has now a sort of grippy rubberised material on the body side inside. I was a motorcycle dispatch rider for 32 years and used the mountain shirt under my motorcycle suit. In the upper map pocket of the mountain shirt I would keep a decent quality torch switched on next to my heart for added warmth. The buffalo Pertex material would also handle any ingress of rainwater from the outer motorcycle jacket, it was a real lifesaver over each winter 5 days a week for 14 years. I'm retired now so splashed out on this new one for walking and hiking. I love its light weight, best worn directly next to the skin however it's ok to wear a T shirt under for prudence as the day warms up. All in all I think the Buffalo is an investment, rain resistant and I have been soaked totally but it's not the end of the world as it seems to dry out as you walk.  

  Stephen Carrington
31st March, 2022

Rated: 5/5

  6 of 31

  A stalwart classic, bombproof and reliable product. If only it packed down smaller it would be perfect. I went for the 48 inch chest, which is quite big, I generally tend to size up with outdoor kit, I could have got away with the 46, so my advice would be order true to size, as its long in the body and arms. Its also noted that this is on sale for significantly more money on other sites. Very happy with the cost, the service and the delivery times. Thank you RayMears.com  

  Matthew King
12th May, 2021

Rated: 5/5

  7 of 31

  Top quality piece of kit. I've been looking at this for a while and finally took the plunge and haven't regretted it. Haven't worn it next to my skin yet but great as a final layer. Best price found on this site and I am a big fan of Ray so a it is a result all round. It is expensive but worth the money in my opinion and will last for years I'm sure.  

  Sam Richards
5th May, 2021

Rated: 5/5

  8 of 31

  Really lovely quality and incredibly warm, the lined pockets are fantastic for winter days.  

29th April, 2021

Rated: 5/5

  9 of 31

  Excellent customer care. Thank you for your immediate attention to my online order that I received the very next day. Quality product at a great price.  

  Jane Schofield
6th April, 2021

Rated: 5/5

  10 of 31

  Buffalo systems mountain shirt is superb. I wear mine against my skin but sometimes with a thermal base layer depending on the temperature and what I am doing but it keeps me warm and dry. The ventilation zips are great to cool off a little if needed. Like all of the kit I have bought from Ray’s Woodlore site it’s top notch and by being on the site has already passed the sniff test. The order arrived the very next day too so excellent customer service.  

  William Allen
14th February, 2021

Rated: 5/5

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