My chilly bean has a rainsheet neck, a 200g neck and the Rhino Plus 100g I ordered on Black Friday came with a 100g neck. The Rhino Plus has Velcro strip neck attachment instead of the tab and rings of his other Rhinos (this irks me).
In the fall he gets his 0g Rhino original. Then I add the 0g neck. Next the 100g liner (I was hoping to use the new 100g turnout with a 0g neck - I expect I will add rings to the 100g turnout so I’ll have that option).
I left him in the 0g neck when it got cold enough for the 200g liner.
The next step was 200g neck with 200g liner.
We’ve had a freezing cold snap this week and I wanted to put the 100g Rhino Plus over the Rhino Original with 200g liner, but as I couldn’t put the 200g neck on the 100g Plus I put the Plus underneath. I did try the Rhino Plus with neck over the Rhino Original with neck but it was too much, and the 100g neck was too little on its own. This 200g neck with 100g+200g blanket was for -27C (feels like -36C) conditions. (C and F intersect around -39)
For my non chilly horse he typically wears a 200g Wug and I put a 100g Amigo with 150g neck over it for the cold snaps and winter storms. Tomorrow we’re expecting up to 40cm (15") of snow and I want his neck covered, but it’s going up to -7C so I pulled the Wug and put a 100g liner under the 100g Amigo. I could have swapped the 150g neck for a 0g, but didn’t feel that was necessary.
When I ordered the Rhino Plus I didn’t know how much fill the neck had as the description didn’t say. The description also failed to specify which of the Horseware neck attachment systems it had. As the description was identical on every site I looked at I blame Horseware Ireland for the omissions.
While I haven’t had need for a 100g neck I’m sure I will find use for it now that I’ve got one.
Final answer - I recommend a 0g and a midweight neck, and using the neck that is equal to or less than the blanket weight.