We need a harness for our zip line for our 4 year olds that are 42 inches tall and weigh 53 lbs. I like the full boy harness, but am not sure which harness is best for them. Would you recommend the Simba or the O.? Thanks.
I have a 150" zipline in the backyard. My 6-8 year old girls use one
http://www.backcountry.com/store/PTZ0139/Petzl-Ouistiti-Full-Body-Climbing-Harness-Kids.html and http://www.backcountry.com/store/BLD0427/Black-Diamond-Wiz-Kid-Harness.html
I have had a big 3 year old comfortably fit into the Ouistiti. The girls flip upside down wearing either one and are very safe. Look also at the http://www.backcountry.com/store/MET0057/Metolius-PAS-Personal-Anchor-System-w-Element-Locking-Carabiner.html
as a easy means to adjust the distance from the ground or cable.
Ouitsi is better for the four year old. About age 5 or 6 the outgrow it and need the Simba.
The simba would proably work best for a kid that size, especially considering they're going to keep growing. If you have smaller kids coming up you might consider the Petzl Ouistiti instead.