NEMO Equipment GOG EX - Manual (Page 3)

3. ExoFly™ Retractable Vestibule: Gogo™ EX
features a unique morphing vestibule. The tent
is designed to store gear inside where it can stay
dry and close at hand, but if you need a temporary
vestibule simply unclip and retract the inner tent
from the fly.
4. Swallowtail: The reinforced pocket on the
Gogo™ EX foot end provides a place to insert a
stick or other rigid object. With the stick in place,
the Swallowtail patterning causes the entire bivy
to tension. This will help keep the bivy off your
sleeping bag and promote better air circulation.
Gogo™ EX can be used without the stick and
simply behaves like a traditional bivy.
5. Watertight Compression Sack: Many of the
NEMO tents include watertight dry bags, including
Gogo™ EX. Having your tent in a watertight stuff
sack means it won’t take on water weight if it’s
in your backpack while you’re hiking in the rain,
or if it’s in your kayak when you roll your boat.
Alternatively, if you have to pack your tent wet, it
will help keep the rest of the gear in your pack dry.