How do you wash this sleeping bag. Is it machine washable?

Tech Specs:

Material:

[Shell] 20D nylon; [Lining] 20D nylon 

Insulation:

ThermicMicro 

Shape:

Mummy 

Draft Collar:

No 

Max User Height:

[Short] 5ft 6in (168cm); [Regular] 6ft (182cm); [Long] 6ft 6in (198cm) 

Shoulder / Hip / Foot Circumference:

60 / NA / 38in (152/ NA / 97cm) 

Stuff Size:

6 x 8in (15 x 20cm) 

Stuff or Storage Sack:

Both 

Degree:

45F (7C) 

Weight:

[Short] 22oz (620g); [Regular] 24oz (680g); [Long] 26oz (740g) 

Recommended Use:

Ultralight summer backpacking 

Manufacturer Warranty:

Lifetime 

Country of Origin:

China