Specifications:

Brand: HIGHRUN                      Size:XS-XXL
Material:2.2mm neoprene+EPE foam inside

Life Jacket Buoyancy List
Size	Chest	Weight	Buoyancy
	(cm)	(kg)	MIN(N)
XS	71-81	40-50	40
S	81-91	50-60	50
M	91-101	60-70	60
L	101-111	70-80	70
XL	111-121	80-90	70
XXL	121-131	90	70

Knowledgement: four inflation methods for air-only lifejackets
There are four inflation methods for air-only lifejackets. It is important to know which method your lifejacket uses and how it works.
Oral Some older lifejackets had oral inflation as their only method of inflation, normally via a one-way valve. Although intended for oral inflation, a suitable low pressure pump may be used if preferred. These lifejackets should be fully inflated before going afloat, and should be worn fully inflated until the wearer is back ashore. Although it is doubtful whether these are still in production, they may still be found in use. Modern lifejackets, inflated by means of a gas cartridge, usually if not always have oral inflation as well; this is intended for topping up if the casualty is in the water for an extended period while awaiting rescue, but may also be useful for inflating the lifejacket for test purposes to verify the integrity of the bladder. Hydrostatic (Hammar) Hydrostatic or Hammar action lifejackets work the same way, but the pellet is protected by a case that only lets water in once it is a few centimetres below the surface. It won't fire until fully submerged.