This helmet seems a little smaller in size Medium than my old Boeri, wondering if I should return it for a Large instead, or if that would be loose on my head... anyon have a comparison out there between Boeri and Bern sizing?

Tech Specs:

Material:

[Shell] ABS; [Liner] multi-impact Brock foam 

Ventilation:

7 Top vents, 4 back vents 

Adjustability:

Sliding chin strap 

Weight:

1lb (454g) 

Recommended Use:

Skiing, snowboarding, skateboarding, mountain biking, BMX 

Manufacturer Warranty:

Unlimited 

Country of Origin:

United States