Compare how an extension attaches.

A fit and construction guide to extension sleeves with integral straps and hollow attachments sold with harnesses.

Measure two parts

Read the strap or harness range separately from the dimensions of the hollow attachment.

PPA Extender with Jock Strap
Jock-style strap and ring · 2 in listed ring diameter
OptiMALE Thick Extender
Integrated ball strap · 6 in overall; 2 in listed diameter
OptiMALE Thin Extender
Integrated ball strap · 6 in overall; 1.5 in listed diameter
Merci Jacked Up Thick Extender
Attached ball strap · 8 in described length
Performance Plus Fortitude
Integrated ball strap · Dual-density silicone listed
Fantasy X-Tension Elite
Flexible strap; removable tip · 3 in removable extension listed

Performance Maxx Smooth Harness Set
Waist and thigh straps; metal ring · 2 in solid head listed
Body Extensions Be Strong Set
Elastic and silicone harness · Hollow silicone attachment
Fantasy X-Tensions Performance Hollow Set
Adjustable elastic harness · 1.6 in listed inner diameter
Erection Assistant Hollow Harness Set
Adjustable jock-style harness · 29–59 in published waist range

Compare integral straps and separate harnesses
Identify what carries the attachment and what comes in the box.
Measure the harness and cavity separately
Do not substitute package width or overall size for fit.
Separate components for cleaning and storage
Identify which parts detach and what the maker allows you to wash.