Today I'm featuring my collection of locking collars in this thread. They are made from a wide variety of materials, and have a wide variety of locking mechanisms. They are all completely inescapable without the key. I'd love to know what you think about each collar.

Today I'm featuring my collection of locking collars in this thread.
Here is the collar that came with my hood from @MaxCita. It's made of BioThane coated webbing. It is strong, lightweight, and is somewhat flexible. The steel buckle uses a normal padlock or a timer lock.

Today I'm featuring my collection of locking collars in this thread.
Here is my fur-lined leather collar from Strict Leather. It has three steel D-rings and a steel buckle that accepts a normal padlock or a timer lock. It's very comfortable due to the soft fur lining. Semi-rigid.

Today I'm featuring my collection of locking collars in this thread.
I got thisvcollar on Etsy. It has a heavy canvas belt with metal grommets, rectangular steel O-rings, and a soft padded lining with a velcro closure. Flexible and lightweight. Locks with a Segufix magnetic lock.

Today I'm featuring my collection of locking collars in this thread.
These two were made by @Crunchycurl. Made of two layers of flexible lightweight nylon webbing, with welded stainless steel D-rings. The buckles feature a built-in combination lock. The combination is changeable.

Today I'm featuring my collection of locking collars in this thread.
Here is my ultra heavy-duty high-security leather padded collar from Humane Restraint. THICK rigid leather on the outside, but buttery soft leather lining inside. It has a built-in lock. This monster is HEAVY!

That's all of the locking collars in my collection...for now. If you have any questions about them, please post them. Also, I'd love to hear what you think about each collar.
I encourage you to post photos/descriptions of YOUR locking collars to this thread.